source: main/trunk/greenstone2/perllib/cgiactions/metadataaction.pm@ 27312

###########################################################################
#
# metadataaction.pm -- 
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the 
# University of Waikato, New Zealand.
#
# Copyright (C) 2009 New Zealand Digital Library Project
#
# This program is free software; you can redistr   te it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
###########################################################################

package metadataaction;

use strict;

use cgiactions::baseaction;

use dbutil;
use ghtml;

use JSON;


BEGIN {
#    unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan/perl-5.8");
    require XML::Rules;
}

@metadataaction::ISA = ('baseaction');

my $action_table =
{
    #GET METHODS
    "get-import-metadata" => { 
        'compulsory-args' => [ "d", "metaname" ],
        'optional-args'   => [ "metapos" ] },

    "get-archives-metadata" => { 
        'compulsory-args' => [ "d", "metaname" ],
        'optional-args'   => [ "metapos" ] },
    
    "get-index-metadata" => { 
        'compulsory-args' => [ "d", "metaname" ],
        'optional-args'   => [ "metapos" ] }, 

    "get-metadata" => { # alias for get-index-metadata
        'compulsory-args' => [ "d", "metaname" ],
        'optional-args'   => [ "metapos" ] },

    "get-live-metadata" => { 
        'compulsory-args' => [ "d", "metaname" ],
        'optional-args'   => [ ] }, 

    "get-metadata-array" => { # where param can be ONE of: index (default), import, archives, live
        'compulsory-args' => [ "json" ],
        'optional-args'   => [ "where" ],
        'help-string' => [
        'metadata-server.pl?a=get-metadata-array&c=demo&where=index&json=[{"docid":"HASHc5bce2d6d3e5b04e470ec9","metatable":[{"metaname":"username","metapos":"all"},{"metaname":"usertimestamp","metapos":"all"}, {"metaname":"usercomment","metapos":"all"}]}]'
        ]},

    #SET METHODS
    "set-live-metadata" => { 
        'compulsory-args' => [ "d", "metaname", "metavalue" ],
        'optional-args'   => [ ] },

    "set-metadata" => { # generic set-meta function. The 'where' param can be set to any combination of index|archives|import|live. docid d is still compulsory for setting index, archives and live meta
        'compulsory-args' => [ "metaname", "metavalue" ],
        'optional-args'   => [ "where", "metapos", "metamode", "prevmetavalue", "d", "f" ] }, 

    "set-index-metadata" => { 
        'compulsory-args' => [ "d", "metaname", "metavalue" ],
        'optional-args'   => [ "metapos", "metamode" ] },

    "set-archives-metadata" => { 
        'compulsory-args' => [ "d", "metaname", "metavalue" ],
        'optional-args'   => [ "metapos", "metamode", "prevmetavalue" ] }, # metamode can be "accumulate", "override",
    
    "set-import-metadata" => { 
        'compulsory-args' => [ "metaname", "metavalue" ],
        'optional-args'   => [ "d", "f", "metamode", "metapos", "prevmetavalue" ] }, # metamode can be "accumulate", "override", or "unique-id". Also need to add the ability to specify a previous metadata value to overwrite (because we can't use metapos). Metapos now supported, but assumes you are working with a Simple (instead of Complex) collection
                 
    #SET METHODS (ARRAY)
    "set-metadata-array" => { 
        'compulsory-args' => [ "where", "json" ],
        'optional-args'   => [ ],
        'help-string' => [
        'A simple example: metadata-server.pl?a=set-metadata-array&where=archives|index|import&c=demo&json=[{"docid":"HASHc5bce2d6d3e5b04e470ec9","metaname":"Title","metavalue":"Tralalala","metamode":"accumulate"},{"docid":"HASHbe483fa4df4e096335d1c8","metaname":"Title","metavalue":"Lala was here","metapos":0, "metamode":"override"}]', 
        
        'A more complex example: metadata-server.pl?a=set-metadata-array&where=archives|index&c=demo&json=[{"docid":"HASHc5bce2d6d3e5b04e470ec9.1","metatable":[{"metaname":"Title","metavals":["Transformers","Robots in disguise","Autobots"]}],"metamode":"override"},{"docid":"HASHbe483fa4df4e096335d1c8.2","metaname":"Title","metavalue":"Pinky was here","metamode":"accumulate"}]' ] },

# The same examples rewritten for when running the metadata-server.pl script from the commandline:

# the simple example: metadata-server.pl a="set-metadata-array" where="archives|index|import" c="demo" json="[{\"docid\":\"HASHc5bce2d6d3e5b04e470ec9\",\"metaname\":\"Title\",\"metavalue\":\"Tralalala\",\"metamode\":\"accumulate\"},{\"docid\":\"HASHbe483fa4df4e096335d1c8\",\"metaname\":\"Title\",\"metavalue\":\"Lala was here\",\"metapos\":0, \"metamode\":\"override\"}]",
        
# the more complex example: metadata-server.pl a="set-metadata-array" where="archives|index" c="demo" json="[{\"docid\":\"HASHc5bce2d6d3e5b04e470ec9.1\",\"metatable\":[{\"metaname\":\"Title\",\"metavals\":[\"Transformers\",\"Robots in disguise\",\"Autobots\"]}],\"metamode\":\"override\"},{\"docid\":\"HASHbe483fa4df4e096335d1c8.2\",\"metaname\":\"Title\",\"metavalue\":\"Pinky was here\",\"metamode\":\"accumulate\"}]"
                     
    "set-archives-metadata-array" => { 
        'compulsory-args' => [ "json" ],
        'optional-args'   => [ ] },
        
    "set-import-metadata-array" => {
        'compulsory-args' => [ "json" ],
        'optional-args'   => [ ] },

    "set-index-metadata-array" => {
        'compulsory-args' => [ "json" ],
        'optional-args'   => [ ] },
    
    "set-live-metadata-array" => {
        'compulsory-args' => [ "json" ],
        'optional-args'   => [ ] },
        
    #REMOVE METHODS
    "remove-import-metadata" => { 
        'compulsory-args' => [ "d", "metaname", "metavalue" ], #TODO: add f argument
        'optional-args'   => [ "metapos" ] }, # only provide metapos arg for SIMPLE collections
                     
    "remove-archives-metadata" => { 
        'compulsory-args' => [ "d", "metaname" ], #TODO: add f argument
        'optional-args'   => [ "metapos", "metavalue" ] },

    "remove-live-metadata" => {
        'compulsory-args' => [ "d", "metaname" ],
        'optional-args'   => [ ] },

    "remove-index-metadata" => {
        'compulsory-args' => [ "d", "metaname" ],
        'optional-args'   => [ "metapos", "metavalue" ] },

    "remove-metadata" => { # generic remove-meta function. The 'where' param can be set to any combination of index|archives|import|live. docid d is still compulsory for setting index, archives and live meta
        'compulsory-args' => [ "d", "metaname" ],
        'optional-args'   => [ "where", "metapos", "metavalue" ] },

    #INSERT METHODS
    "insert-metadata" => { 
        'compulsory-args' => [ "d", "metaname", "metavalue" ],
        'optional-args'   => [ ] }
};


sub new 
{
    my $class = shift (@_);
    my ($gsdl_cgi,$iis6_mode) = @_;

    # Treat metavalue specially.  To transmit this through a GET request
    # the Javascript side has url-encoded it, so here we need to decode
    # it before proceeding

    my $url_encoded_metavalue = $gsdl_cgi->param("metavalue");
    my $url_decoded_metavalue = &unicode::url_decode($url_encoded_metavalue,1);
    my $unicode_array = &unicode::utf82unicode($url_decoded_metavalue);

    $url_decoded_metavalue = join("",map(chr($_),@$unicode_array));
    $gsdl_cgi->param("metavalue",$url_decoded_metavalue);

    my $self = new baseaction($action_table,$gsdl_cgi,$iis6_mode);

    return bless $self, $class;
}


sub get_live_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $gsdlhome  = $self->{'gsdlhome'};
    my $infodbtype = $self->{'infodbtype'};
    
    # live metadata gets/saves value scoped (prefixed) by the current usename 
    # so (for now) let's not bother to enforce authentication

    # Obtain the collect dir
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    # look up additional args
    my $docid  = $self->{'d'};
    if ((!defined $docid) || ($docid =~ m/^\s*$/)) {
       $gsdl_cgi->generate_error("No docid (d=...) specified.");
    }

    # Generate the dbkey
    my $metaname  = $self->{'metaname'};
    my $dbkey = "$docid.$metaname";

    # To people who know $collect_tail please add some comments
    # Obtain path to the database
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/|\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, "live-$collect_tail", $index_text_directory);
    
    # Obtain the content of the key
    my $cmd = "gdbmget $infodb_file_path $dbkey";
    if (open(GIN,"$cmd |") == 0) {
        # Catch error if gdbmget failed
    my $mess = "Failed to get metadata key: $metaname\n";
    $mess .= "$!\n";

    $gsdl_cgi->generate_error($mess);
    }
    else {
    binmode(GIN,":utf8");
        # Read everything in and concatenate them into $metavalue
    my $metavalue = "";
    my $line;
    while (defined ($line=<GIN>)) {
        $metavalue .= $line;
    }
    close(GIN);
    chomp($metavalue); # Get rid off the tailing newlines
    $gsdl_cgi->generate_ok_message("$metavalue");
    }

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

# just calls the index version
sub get_metadata
{
    my $self = shift @_;
    $self->get_index_metadata(@_);
}

# JSON version that will get the requested metadata values 
# from the requested source (index, import, archives or live)
# One of the params is a JSON string and the return value is JSON too
# http://forums.asp.net/t/1844684.aspx/1 - Web api method return json in string
sub get_metadata_array
{
    my $self = shift @_;

    my $where = $self->{'where'};
    if (!$where) {  
    $where = "index"; # default behaviour is to get the values from index
    }

    # Only when setting metadata do we perform authentication and do we lock the collection
    # not when getting metadata

    # for get_meta_array, the where param can only be ONE of import, archives, index, live
    if($where =~ m/index/) {
    $self->_get_index_metadata_array(@_);
    }
    # still to be implemented for archives, import and live
}

# takes a JSON string and returns a JSON string
sub _get_index_metadata_array
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);

    # look up additional args    
    my $infodbtype = $self->{'infodbtype'};
    
    # To people who know $collect_tail please add some comments
    # Obtain the path to the database
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, $collect_tail, $index_text_directory);

    my $json_str      = $self->{'json'};
    my $doc_array = decode_json $json_str;

    my $json_result_str = "[";
    my $first_doc_rec = 1;

    foreach my $doc_array_rec ( @$doc_array ) {
    
    my $docid     = $doc_array_rec->{'docid'};
    
    if($first_doc_rec) {
        $first_doc_rec = 0;
    } else {
        $json_result_str .= ",";
    }
    $json_result_str = $json_result_str . "{docid:\"" . $docid . "\"";  

    my $metatable = $doc_array_rec->{'metatable'}; # a subarray, or need to generate an error saying JSON structure is wrong
    $json_result_str = $json_result_str . ",metatable:[";

    my $first_rec = 1;
    foreach my $metatable_rec ( @$metatable ) { # the subarray metatable is an array of hashmaps        
        if($first_rec) {
        $first_rec = 0;
        } else {
        $json_result_str .= ",";        
        }
        
        my $metaname  = $metatable_rec->{'metaname'};
        $json_result_str .= "{metaname:\"$metaname\",metavals:[";

        my $metapos   = $metatable_rec->{'metapos'}; # 0... 1|all|undefined
        if(!defined $metapos) {
        $metapos = "all";
        }

         # Read the docid entry
        my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $infodb_file_path, $docid);
  
        # Basically loop through and unescape_html the values
        foreach my $k (keys %$doc_rec) {
        my @escaped_v = ();
        foreach my $v (@{$doc_rec->{$k}}) {
            my $ev = &ghtml::unescape_html($v);
            push(@escaped_v, $ev);
        }
        $doc_rec->{$k} = \@escaped_v;
        }

        # Obtain the specified metadata value(s)
        my $metavalue;

        if($metapos ne "all") { # get the value at a single metapos

        $metavalue = $doc_rec->{$metaname}->[$metapos];     
        $json_result_str .= "{metapos:\"$metapos\",metavalue:\"$metavalue\"}";

        } else {
        my $first_metaval = 1;
        $metapos = 0;
        $metavalue = $doc_rec->{$metaname}->[$metapos];

        while (defined $metavalue) {
            if($first_metaval) {        
            $first_metaval = 0;
            } else {
            $json_result_str .= ",";
            }
        
            $json_result_str .= "{metapos:\"$metapos\",metavalue:\"$metavalue\"}";

            $metapos++;
            $metavalue = $doc_rec->{$metaname}->[$metapos];         
        }
        }

        $json_result_str .= "]}"; # close metavals array and metatable record
    }
    
    $json_result_str .= "]}"; # close metatable array and docid record
    }

    $json_result_str .= "]"; # close array of docids

    $gsdl_cgi->generate_ok_message($json_result_str);    
}


sub get_index_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $gsdlhome  = $self->{'gsdlhome'};

    # Authenticate user if it is enabled
    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Obtain the collect dir
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    ##my $collect_dir = &util::filename_cat($gsdlhome, "collect");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    # look up additional args
    my $docid     = $self->{'d'};
    my $metaname  = $self->{'metaname'};
    my $metapos   = $self->{'metapos'};
    my $infodbtype = $self->{'infodbtype'};

    # To people who know $collect_tail please add some comments
    # Obtain path to the database
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, $collect_tail, $index_text_directory);

    # Read the docid entry
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $infodb_file_path, $docid);
  
    # Basically loop through and unescape_html the values
    foreach my $k (keys %$doc_rec) {
    my @escaped_v = ();
    foreach my $v (@{$doc_rec->{$k}}) {
        my $ev = &ghtml::unescape_html($v);
        push(@escaped_v, $ev);
    }
    $doc_rec->{$k} = \@escaped_v;
    }

    # Obtain the specified metadata value
    $metapos = 0 if (!defined $metapos);
    my $metavalue = $doc_rec->{$metaname}->[$metapos];
    $gsdl_cgi->generate_ok_message("$metavalue");
    
    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}


sub get_import_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $gsdlhome  = $self->{'gsdlhome'};

    # Authenticate user if it is enabled
    if ($baseaction::authentication_enabled) {
        # Ensure the user is allowed to edit this collection
        $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Obtain the collect dir
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    ##my $collect_dir = &util::filename_cat($gsdlhome, "collect");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    # look up additional args
    my $docid     = $self->{'d'};
    my $metaname  = $self->{'metaname'};
    my $metapos = $self->{'metapos'};
    $metapos = 0 if (!defined $metapos); # gets the first value by default since metapos defaults to 0

    my $infodbtype = $self->{'infodbtype'};
    if (!defined $docid) 
    {
        $gsdl_cgi->generate_error("No docid (d=...) specified.\n");
    } 

    # Obtain where the metadata.xml is from the archiveinfo-doc.gdb file
    # If the doc oid is not specified, we assume the metadata.xml is next to the specified "f"
    my $metadata_xml_file;
    my $import_filename = undef;
    

    my $archive_dir = &util::filename_cat($collect_dir, $collect, "archives");
    my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $arcinfo_doc_filename, $docid);

    # This now stores the full pathname
    $import_filename = $doc_rec->{'src-file'}->[0];

    # figure out correct metadata.xml file [?]
    # Assuming the metadata.xml file is next to the source file
    # Note: This will not work if it is using the inherited metadata from the parent folder
    my ($import_tailname, $import_dirname) = File::Basename::fileparse($import_filename);
    my $metadata_xml_filename = &util::filename_cat($import_dirname, "metadata.xml");

    $gsdl_cgi->generate_ok_message($self->get_metadata_from_metadata_xml($gsdl_cgi, $metadata_xml_filename, $metaname, $metapos, $import_tailname));

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

sub get_metadata_from_metadata_xml
{
    my $self = shift @_;
    my ($gsdl_cgi, $metadata_xml_filename, $metaname, $metapos, $src_file) = @_;
    
    my @rules = 
    ( 
        _default => 'raw',
        'Metadata' => \&gfmxml_metadata,
        'FileName' => \&mxml_filename
    );
        
    my $parser = XML::Rules->new
    (
        rules => \@rules,
        output_encoding => 'utf8'
    );
    
    my $xml_in = "";
    if (!open(MIN,"<$metadata_xml_filename")) 
    {
        $gsdl_cgi->generate_error("Unable to read in $metadata_xml_filename: $!");
    }
    else 
    {
        # Read them in
        my $line;
        while (defined ($line=<MIN>)) {
            $xml_in .= $line;
        }
        close(MIN); 

        $parser->parse($xml_in, {metaname => $metaname, metapos => $metapos, src_file => $src_file});
        
        if(defined $parser->{'pad'}->{'metavalue'})
        {
            return $parser->{'pad'}->{'metavalue'};
        }
        else
        {
            return "";
        }
    }
}

sub gfmxml_metadata
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;

    # no subsection support yet in metadata.xml

    if (($parser->{'parameters'}->{'src_file'} eq $parser->{'parameters'}->{'current_file'}) && $parser->{'parameters'}->{'metaname'} eq $attrHash->{'name'})
    {
        if (!defined $parser->{'parameters'}->{'poscount'})
        {
            $parser->{'parameters'}->{'poscount'} = 0;
        }
        else
        {
            $parser->{'parameters'}->{'poscount'}++;
        }
    
        # gets the first value by default, since metapos defaults to 0
        if (($parser->{'parameters'}->{'poscount'} == $parser->{'parameters'}->{'metapos'}))
        {
            if($parser->{'parameters'}->{'metapos'} > 0) {
            print STDERR "@@@@ WARNING: non-zero metapos.\n";
            print STDERR "@@@@ Assuming SIMPLE collection and proceeding to retrieve the import meta at".$parser->{'parameters'}->{'metapos'}.".\n";
            }
            $parser->{'pad'}->{'metavalue'} = $attrHash->{'_content'};
        }
    }
}

sub get_archives_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $gsdlhome  = $self->{'gsdlhome'};
    my $infodbtype = $self->{'infodbtype'};

    # Authenticate user if it is enabled
    if ($baseaction::authentication_enabled) {
        # Ensure the user is allowed to edit this collection        
        $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Obtain the collect dir
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    
    my $archive_dir = &util::filename_cat($collect_dir, $collect, "archives");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);
    
    # look up additional args
    my ($docid, $docid_secnum) = ($self->{'d'} =~ m/^(.*?)(\..*)?$/);
    $docid_secnum = "" if (!defined $docid_secnum);
    
    my $metaname = $self->{'metaname'};
    my $metapos = $self->{'metapos'};
    $metapos = 0 if (!defined $metapos);
    
    my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $arcinfo_doc_filename, $docid);

    # This now stores the full pathname
    my $doc_filename = $doc_rec->{'doc-file'}->[0]; 

    $gsdl_cgi->generate_ok_message($self->get_metadata_from_archive_xml($gsdl_cgi, &util::filename_cat($archive_dir, $doc_filename), $metaname, $metapos, $docid_secnum));

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

sub get_metadata_from_archive_xml
{
    my $self = shift @_;
    my ($gsdl_cgi, $doc_xml_filename, $metaname, $metapos, $secid) = @_;
    
    my @start_rules = ('Section' => \&dxml_start_section);
    
    my @rules = 
    ( 
        _default => 'raw',
        'Metadata' => \&gfdxml_metadata
    );
        
    my $parser = XML::Rules->new
    (
        start_rules => \@start_rules,
        rules => \@rules,
        output_encoding => 'utf8'
    );
    
    my $xml_in = "";
    if (!open(MIN,"<$doc_xml_filename")) 
    {
        $gsdl_cgi->generate_error("Unable to read in $doc_xml_filename: $!");
    }
    else 
    {
        # Read them in
        my $line;
        while (defined ($line=<MIN>)) {
            $xml_in .= $line;
        }
        close(MIN); 

        $parser->parse($xml_in, {metaname => $metaname, metapos => $metapos, secid => $secid});
        
        if(defined $parser->{'pad'}->{'metavalue'})
        {
            return $parser->{'pad'}->{'metavalue'};
        }
        else
        {
            return "";
        }
    }
}

sub gfdxml_metadata
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;
    
    if(!($parser->{'parameters'}->{'secid'} eq $parser->{'parameters'}->{'curr_section_num'}))
    {
        return;
    }

    if ($parser->{'parameters'}->{'metaname'} eq $attrHash->{'name'})
    {
        if (!defined $parser->{'parameters'}->{'poscount'})
        {
            $parser->{'parameters'}->{'poscount'} = 0;
        }
        else
        {
            $parser->{'parameters'}->{'poscount'}++;
        }
    }

    if (($parser->{'parameters'}->{'metaname'} eq $attrHash->{'name'}) && ($parser->{'parameters'}->{'poscount'} == $parser->{'parameters'}->{'metapos'}))
    {   
        $parser->{'pad'}->{'metavalue'} = $attrHash->{'_content'};
    }
}

sub _set_live_metadata
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    #my $gsdlhome  = $self->{'gsdlhome'};
    my $infodbtype = $self->{'infodbtype'};

    # Obtain the collect dir
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    ##my $collect_dir = &util::filename_cat($gsdlhome, "collect");


    # look up additional args
    my $docid     = $self->{'d'};
    if ((!defined $docid) || ($docid =~ m/^\s*$/)) {
      $gsdl_cgi->generate_error("No docid (d=...) specified."); # generates error and dies
    }
    my $metavalue = $self->{'metavalue'};

    # Generate the dbkey    
    my $metaname  = $self->{'metaname'};
    my $dbkey = "$docid.$metaname";

    # To people who know $collect_tail please add some comments
    # Obtain path to the database
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, "live-$collect_tail", $index_text_directory);

    # Set the new value
    my $cmd = "gdbmset \"$infodb_file_path\" \"$dbkey\" \"$metavalue\"";
    my $status = system($cmd);
    if ($status != 0) {
        # Catch error if gdbmget failed
    my $mess = "Failed to set metadata key: $dbkey\n";

    $mess .= "PATH: $ENV{'PATH'}\n";
    $mess .= "cmd = $cmd\n";
    $mess .= "Exit status: $status\n";
    $mess .= "System Error Message: $!\n";

    $gsdl_cgi->generate_error($mess);
    }
    else {
    $gsdl_cgi->generate_ok_message("set-live-metadata successful: Key[$metaname]=$metavalue");
    }

    #return $status; # in case calling functions have any further use for this
}

sub set_live_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
  
    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_set_live_metadata(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

sub set_index_metadata_entry
{
    my $self = shift @_;
    my ($collect_dir,$collect,$infodbtype,$docid,$metaname,$metapos,$metavalue,$metamode) = @_;
    
    # To people who know $collect_tail please add some comments
    # Obtain path to the database
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, $collect_tail, $index_text_directory);
    
#   print STDERR "**** infodb file path = $infodb_file_path\n";
#   print STDERR "***** infodb type = $infodbtype\n";
    
    # Read the docid entry
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $infodb_file_path, $docid);
    
    # Set the metadata value
    if (defined $metapos) {
    # if metamode=accumulate AND metapos, warn user and then use metapos
    if (defined $metamode && $metamode eq "accumulate") {
        print STDERR "**** Warning: metamode is set to accumulate yet metapos is also provided for $docid\n";
        print STDERR "**** Proceeding by using metapos\n";
    }
    $doc_rec->{$metaname}->[$metapos] = $metavalue;
    }
    elsif (defined $metamode && $metamode eq "override") {
    $doc_rec->{$metaname} = [ $metavalue ]; 
    }
    else { # default for index was to override, but because accumulate is less destructive, 
    # and because accumulate is the default for archives and import, that's the new default for index too
    if(defined $doc_rec->{$metaname}) {
        push(@{$doc_rec->{$metaname}}, $metavalue); # accumulate the value for that metaname
    } else {
        $doc_rec->{$metaname} = [ $metavalue ];
    }
    }
 
    my $status = &dbutil::set_infodb_entry($infodbtype, $infodb_file_path,$docid,$doc_rec);
    
    return $status;
    
}

sub _set_import_metadata
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $infodbtype = $self->{'infodbtype'};
#    my $gsdlhome  = $self->{'gsdlhome'};
     
    # Obtain the collect and archive dir    
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");
    my $archive_dir = &util::filename_cat($collect_dir,$collect,"archives");
   
    # look up additional args
    # want either d= or f=
    my $docid  = $self->{'d'};
    my ($docid_root,$docid_secnum);
    if(defined $docid) {    
    ($docid_root,$docid_secnum) = ($docid =~ m/^(.*?)(\..*)?$/);    
    # as yet no support for setting subsection metadata in metadata.xml
    if ((defined $docid_secnum) && ($docid_secnum !~ m/^\s*$/)) {
        $gsdl_cgi->generate_message("*** No support yet for setting import metadata at subsections level.\n");
        return;
    }
    }

    my $import_file  = $self->{'f'};
    if ((!defined $docid) && (!defined $import_file)) {
    $gsdl_cgi->generate_error("No docid (d=...) or import file (f=) specified.");
    } 

    # Get the parameters and set default mode to "accumulate"
    my $metaname   = $self->{'metaname'};
    my $metavalue  = $self->{'metavalue'};
##    $metavalue =~ s/&amp;lt;(.*?)&amp;gt;/<$1>/g;
    $metavalue =~ s/&lt;(.*?)&gt;/<$1>/g;
    
    my $metamode   = $self->{'metamode'};
    if ((!defined $metamode) || ($metamode =~ m/^\s*$/)) {
    # make "accumulate" the default (less destructive, as won't actually 
    # delete any existing values)
    $metamode = "accumulate";
    }

    # adding metapos and prevmetavalue support to import_metadata subroutines
    my $metapos   = $self->{'metapos'}; # don't force undef to 0. Undef has meaning when metamode=override
    my $prevmetavalue = $self->{'prevmetavalue'};

    my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
    my $metadata_xml_filename = $self->set_import_metadata_entry($gsdl_cgi, $arcinfo_doc_filename, $infodbtype, $docid_root, $metaname, $metapos,$metavalue, $metamode,$prevmetavalue, $collect, $collect_dir); # at this point, docid_root = docid

    my $mess = "set-import-metadata successful: Key[$docid] -> $metadata_xml_filename\n";
    $mess .= "  $metaname";
    $mess .= " = $metavalue";
    $mess .= " ($metamode)\n";

    $gsdl_cgi->generate_ok_message($mess);

    #return $status; # in case calling functions have any further use for this
}

# the version of set_index_meta that doesn't do authentication
sub _set_archives_metadata
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $infodbtype = $self->{'infodbtype'};
    
    # Obtain the collect and archive dir   
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site); 
    my $archive_dir = &util::filename_cat($collect_dir,$collect,"archives");

    # look up additional args
    my $docid  = $self->{'d'};
    my $metaname   = $self->{'metaname'};
    my $metavalue  = $self->{'metavalue'};
    my $prevmetavalue = $self->{'prevmetavalue'};
    
    my $metapos    = $self->{'metapos'}; # don't force undef to 0. Undef has meaning when metamode=override
                                  # Don't append "|| undef", since if metapos=0 it will then be set to undef

    my $metamode   = $self->{'metamode'};
    if ((!defined $metamode) || ($metamode =~ m/^\s*$/)) {
    # make "accumulate" the default (less destructive, as won't actually 
    # delete any existing values)
    $metamode = "accumulate";
    }

    my $status = $self->set_archives_metadata_entry($gsdl_cgi,$archive_dir, $collect_dir,$collect, $infodbtype,$docid,
                $metaname,$metapos,$metavalue,$metamode,$prevmetavalue);
   
    if ($status == 0) {
    my $mess = "set-archives-metadata successful: Key[$docid]\n";
    $mess .= "  $metaname";
    $mess .= "->[$metapos]" if (defined $metapos);
    $mess .= " = $metavalue";
    $mess .= " ($metamode)\n";
    
    $gsdl_cgi->generate_ok_message($mess);  
    }
    else {
    my $mess .= "Failed to set archives metadata key: $docid\n";
    $mess .= "Exit status: $status\n";
    if(defined $self->{'error_msg'}) {
        $mess .= "Error Message: $self->{'error_msg'}\n";
    } else {
        $mess .= "System Error Message: $!\n";
    }
    $mess .= "-" x 20 . "\n";
    
    $gsdl_cgi->generate_error($mess);
    }

    #return $status; # in case calling functions have any further use for this
}


# the version of set_index_meta that doesn't do authentication
sub _set_index_metadata
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};

    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);

    # look up additional args
    my $docid     = $self->{'d'};
    my $metaname  = $self->{'metaname'};
    my $metapos   = $self->{'metapos'}; # undef has meaning
    my $metavalue = $self->{'metavalue'};
    my $infodbtype = $self->{'infodbtype'};
    my $metamode  = $self->{'metamode'};    

    my $status = $self->set_index_metadata_entry($collect_dir,$collect,$infodbtype,$docid,$metaname,$metapos,$metavalue,$metamode);
    
    if ($status != 0) {
        # Catch error if set infodb entry failed
    my $mess = "Failed to set metadata key: $docid\n";
    
    $mess .= "PATH: $ENV{'PATH'}\n";
    $mess .= "Exit status: $status\n";
    $mess .= "System Error Message: $!\n";
    
    $gsdl_cgi->generate_error($mess);
    }
    else {
    my $mess = "set-index-metadata successful: Key[$docid]\n";
    $mess .= "  $metaname";
    $mess .= "->[$metapos]" if (defined $metapos);
    $mess .= " = $metavalue\n";
    
    $gsdl_cgi->generate_ok_message($mess);
    }

    #return $status; # in case calling functions have any further use for this
}

sub set_index_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    #my $gsdlhome  = $self->{'gsdlhome'};

    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    
    $gsdl_cgi->checked_chdir($collect_dir);

    # Obtain the collect dir
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_set_index_metadata(@_);
    
    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

# call this to set the metadata for a combination of dirs archives, import or index, or live
# if none specified, defaults to index which was the original behaviour of set_metadata.
sub set_metadata
{
    my $self = shift @_;

    # Testing that not defining a variable, setting it to "" or to "  " all return false
    # >perl -e 'my $whichdirs=""; if($whichdirs) {print "$whichdirs\n"};'

    my $where = $self->{'where'};
    if(!$where) {   
    $self->set_index_metadata(@_); # call the full version of set_index_meta for the default behaviour
    return;
    } 

    # authenticate and lock collection once, even if processing multiple dirs
    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    
    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }
    
    if($where =~ m/index/) {
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    $gsdl_cgi->checked_chdir($collect_dir);
    }

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);


    # now at last can set the metadata. $where can specify multiple
    # $where is of the form: import|archives|index, or a subset thereof

    #my @whichdirs = split('\|', $where);

    # just check whether $where contains import/archives/index/live in turn, and 
    # for each case, process it accordingly
    if($where =~ m/import/) {
    $self->_set_import_metadata(@_);        
    }

    if($where =~ m/archives/) {

    # look up docID arg which is optional to set_metadata because it's optional 
    # to set_import, but which is compulsory to set_archives_metadata
    my $docid     = $self->{'d'};
    if ((!defined $docid) || ($docid =~ m/^\s*$/)) {
        $gsdl_cgi->generate_error("No docid (d=...) specified."); # generates error and dies
    } 
    # we have a docid, so can set archives meta
    $self->_set_archives_metadata(@_);  
    }

    if($where =~ m/index/) {
    
    # look up docID arg which is optional to set_metadata because it's optional 
    # to set_import, but which is compulsory to set_archives_metadata
    my $docid     = $self->{'d'};
    if ((!defined $docid) || ($docid =~ m/^\s*$/)) {
        $gsdl_cgi->generate_error("No docid (d=...) specified.");
    }
    # we have a docid, so can set index meta
    $self->_set_index_metadata(@_); 
    }   

    if($where =~ m/live/) {
    $self->_set_live_metadata(@_); # docid param, d, is compulsory, but is checked for in subroutine
    }

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

sub set_metadata_array
{
    my $self = shift @_;

    my $where = $self->{'where'};
    if(!$where) {   
    $self->set_index_metadata_array(@_); # default behaviour is the full version of set_index_meta_array
    return;
    }

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};

    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Not sure if the checked_chdir is necessary, since lock_collection also does a chdir
    # But including the stmt during this code reorganisation to preserve as-is what used to happen
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    $gsdl_cgi->checked_chdir($collect_dir);

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    if($where =~ m/import/) {
    $self->_set_import_metadata_array(@_);
    }
    if($where =~ m/archives/) {
    $self->_set_archives_metadata_array(@_);
    }
    if($where =~ m/index/) {
    $self->_set_index_metadata_array(@_);
    }
    if($where =~ m/live/) {
        $self->_set_live_metadata_array(@_);
    }

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

sub _set_index_metadata_array
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);

    
    # look up additional args
    
    my $infodbtype = $self->{'infodbtype'};
    
    my $json_str      = $self->{'json'};
    my $doc_array = decode_json $json_str;
    
    
    my $global_status = 0;
    my $global_mess = "";
    
    my @all_docids = ();
    
    foreach my $doc_array_rec ( @$doc_array ) {
    
    my $status = -1;
    my $docid     = $doc_array_rec->{'docid'};
    
    push(@all_docids,$docid);

    my $metaname  = $doc_array_rec->{'metaname'};
    if(defined $metaname) {
        my $metapos   = $doc_array_rec->{'metapos'}; # can legitimately be undef
        my $metavalue = $doc_array_rec->{'metavalue'};
        my $metamode = $doc_array_rec->{'metamode'} || $self->{'metamode'};

        $status = $self->set_index_metadata_entry($collect_dir,$collect,$infodbtype,$docid,$metaname,$metapos,$metavalue,$metamode);
    } elsif (defined $doc_array_rec->{'metatable'}) { # if no metaname, we expect a metatable
        my $metatable = $doc_array_rec->{'metatable'}; # a subarray, or need to generate an error saying JSON structure is wrong
        
        foreach my $metatable_rec ( @$metatable ) { # the subarray metatable is an array of hashmaps
        $metaname  = $metatable_rec->{'metaname'};
        my $metamode  = $metatable_rec->{'metamode'} || $doc_array_rec->{'metamode'} || $self->{'metamode'};
        my $metapos = undef;
        my $metavals = $metatable_rec->{'metavals'}; # a sub-subarray

        foreach my $metavalue ( @$metavals ) { # metavals is an array
            $status = $self->set_index_metadata_entry($collect_dir,$collect,$infodbtype,$docid,$metaname,$metapos,$metavalue,$metamode); # how do we use metamode in set_meta_entry?
            if($metamode eq "override") { # now, having overridden the metavalue for the first, 
            # need to accumulate subsequent metavals for this metaname, else the just-assigned
            # metavalue for this metaname will be lost
            $metamode = "accumulate";
            }
        }           
        }
    }
    
    if ($status != 0) {
        # Catch error if set infodb entry failed
        $global_status = $status;
        $global_mess .= "Failed to set metadata key: $docid\n";
        $global_mess .= "Exit status: $status\n";
        $global_mess .= "System Error Message: $!\n";
        $global_mess .= "-" x 20;
    }
    }
    
    if ($global_status != 0) {
    $global_mess .= "PATH: $ENV{'PATH'}\n";
    $gsdl_cgi->generate_error($global_mess);
    }
    else {
    my $mess = "set-metadata-array successful: Keys[ ".join(", ",@all_docids)."]\n";
    $gsdl_cgi->generate_ok_message($mess);
    }
}

sub set_index_metadata_array
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
#    my $gsdlhome  = $self->{'gsdlhome'};

    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    
    $gsdl_cgi->checked_chdir($collect_dir);

    # Obtain the collect dir
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_set_index_metadata_array(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

# experimental, newly added in and untested
sub _set_live_metadata_array
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};

    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);

    
    # look up additional args
    my $infodbtype = $self->{'infodbtype'};
    # To people who know $collect_tail please add some comments
    # Obtain path to the database
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, "live-$collect_tail", $index_text_directory);

    
    my $json_str      = $self->{'json'};
    my $doc_array = decode_json $json_str;
    
    
    my $global_status = 0;
    my $global_mess = "";
    
    my @all_docids = ();


    foreach my $doc_array_rec ( @$doc_array ) {
    
    my $status = -1;
    my $docid     = $doc_array_rec->{'docid'};

    push(@all_docids,$docid);

    my $metaname  = $doc_array_rec->{'metaname'};
    if(defined $metaname) {
        my $dbkey = "$docid.$metaname";
        my $metavalue = $doc_array_rec->{'metavalue'};

        # Set the new value
        my $cmd = "gdbmset \"$infodb_file_path\" \"$dbkey\" \"$metavalue\"";
        $status = system($cmd);

    } elsif (defined $doc_array_rec->{'metatable'}) { # if no metaname, we expect a metatable
        my $metatable = $doc_array_rec->{'metatable'}; # a subarray, or need to generate an error saying JSON structure is wrong
        foreach my $metatable_rec ( @$metatable ) {
        $metaname  = $metatable_rec->{'metaname'};
        my $dbkey = "$docid.$metaname";

        my $metavals = $metatable_rec->{'metavals'}; # a sub-subarray
        foreach my $metavalue ( @$metavals ) {
             my $cmd = "gdbmset \"$infodb_file_path\" \"$dbkey\" \"$metavalue\"";
             $status = system($cmd);
        }
        }
        
    }

    if ($status != 0) {
        # Catch error if gdbmget failed
        $global_status = $status;
        $global_mess .= "Failed to set metadata key: $docid\n"; # $dbkey
        $global_mess .= "Exit status: $status\n";
        $global_mess .= "System Error Message: $!\n";
        $global_mess .= "-" x 20;
    }
    }
    
    if ($global_status != 0) {
    $global_mess .= "PATH: $ENV{'PATH'}\n";
    $gsdl_cgi->generate_error($global_mess);
    }
    else {
    my $mess = "set-live-metadata-array successful: Keys[ ".join(", ",@all_docids)."]\n";
    $gsdl_cgi->generate_ok_message($mess);
    }
}

sub set_live_metadata_array
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};

    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    
    $gsdl_cgi->checked_chdir($collect_dir);

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_set_live_metadata_array(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}


sub dxml_metadata
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;
    my $metaname = $parser->{'parameters'}->{'metaname'};
    my $metamode = $parser->{'parameters'}->{'metamode'};
    
    print STDERR "**** Processing closing </Metadata> tag\n";
    
    my $opt_doc_secnum = $parser->{'parameters'}->{'secnum'};
    
    # Find the right metadata tag and checks if we are going to
    # override it
    #
    # Note: This over writes the first metadata block it
    # encountered. If there are multiple Sections in the doc.xml, it
    # might not behave as you would expect

    my $curr_secnum = $parser->{'parameters'}->{'curr_section_num'};
##    print STDERR "**** checking $opt_doc_secnum <=> $curr_secnum\n";
##    print STDERR "**** metamode = $metamode\n";
    
    if ((!defined $opt_doc_secnum) || ($opt_doc_secnum eq $curr_secnum)) 
    {
        my $name_attr = $attrHash->{'name'};
        if (($name_attr eq $metaname) && ($metamode eq "override")) 
        {
            if (!defined $parser->{'parameters'}->{'poscount'}) 
            { 
                $parser->{'parameters'}->{'poscount'} = 0; 
            } 
            else 
            { 
                $parser->{'parameters'}->{'poscount'}++; 
            } 
            
            if(defined $parser->{'parameters'}->{'metapos'} && $parser->{'parameters'}->{'poscount'} == $parser->{'parameters'}->{'metapos'})
            {
                ##print STDERR "#### got match!!\n";
                # Get the value and override the current value
                my $metavalue = $parser->{'parameters'}->{'metavalue'};
                $attrHash->{'_content'} = $metavalue;
                
                # Don't want it to wipe out any other pieces of metadata
                $parser->{'parameters'}->{'metamode'} = "done";
            }
            elsif(defined $parser->{'parameters'}->{'prevmetavalue'} && $parser->{'parameters'}->{'prevmetavalue'} eq $attrHash->{'_content'})
            {
                my $metavalue = $parser->{'parameters'}->{'metavalue'};
                $attrHash->{'_content'} = $metavalue;
                $parser->{'parameters'}->{'metamode'} = "done";
            }
        }
    }

    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}

# This method exists purely for catching invalid section numbers that the client
# requested to edit. Once the parser has reached the end (the final </Archive> tag),
# we've seen all the Sections in the doc.xml, and none of their section nums matched
# if the metamode has not been set to 'done' by then.
sub dxml_archive
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;
    my $metamode = $parser->{'parameters'}->{'metamode'};
    
    my $curr_secnum = $parser->{'parameters'}->{'curr_section_num'};
    my $opt_doc_secnum = $parser->{'parameters'}->{'secnum'};
    
#    print STDERR "@@@ $tagname Processing a closing </Archive> tag [$curr_secnum|$opt_doc_secnum]\n";
    
    if ($metamode ne "done" && $curr_secnum ne $opt_doc_secnum) {
    print STDERR "@@@ $tagname Finished processing FINAL Section.\n";

    my $metaname = $parser->{'parameters'}->{'metaname'};
    my $metavalue = $parser->{'parameters'}->{'metavalue'};
    
    print STDERR "@@@ Requested section number $opt_doc_secnum not found.\n";
    print STDERR "\t(last seen section number in document was $curr_secnum)\n";
    print STDERR "\tDiscarded metadata value '$metavalue' for meta '$metaname'\n";
    print STDERR "\tin section $opt_doc_secnum.\n";
    $parser->{'custom_err_msg'} = "Requested section number $opt_doc_secnum not found.";
    }
    
    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}

sub dxml_description
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;
    my $metamode = $parser->{'parameters'}->{'metamode'};

    my $curr_secnum = $parser->{'parameters'}->{'curr_section_num'};
    my $opt_doc_secnum = $parser->{'parameters'}->{'secnum'} || "";
    
    print STDERR "**** Processing a closing </Description> tag \n";
#   print STDERR "@@@ $tagname Processing a closing </Description> tag [$curr_secnum|$opt_doc_secnum]\n";
    
    # Accumulate the metadata

    # We'll be accumulating metadata at this point if we haven't found and therefore
    # haven't processed the metadata yet. 
    # For subsections, this means that if we're at a matching subsection, but haven't 
    # found the correct metaname to override in that subsection, we accumulate it as new
    # meta in the subsection by adding it to the current description.
    # If there's no subsection info for the metadata, it will accumulate at the top level
    # section description if we hadn't found a matching metaname to override at this point.

    # Both curr_secnum and opt_doc_secnum can be "". In the former case, it means we're now
    # at the toplevel section. In the latter case, it means we want to process meta in the
    # toplevel section. So the eq check between the values below will work in all cases.
    
    # The only time this won't work is if an opt_doc_secnum beyond the section numbers of
    # this document has been provided. In that case, the metadata for that opt_doc_secnum
    # won't get attached/accumulated to any part of the doc, not even its top-level section.

    if ($curr_secnum eq $opt_doc_secnum 
        && ($metamode eq "accumulate" || $metamode eq "override")) {
        if ($metamode eq "override") {
        print "No metadata value to override.  Switching 'metamode' to accumulate\n";
        }

        # If we get to here and metamode is override, this means there 
        # was no existing value to overide => treat as an append operation
        
        # Tack a new metadata tag on to the end of the <Metadata>+ block
        my $metaname = $parser->{'parameters'}->{'metaname'};
        my $metavalue = $parser->{'parameters'}->{'metavalue'};
        
        my $metadata_attr = { 
        '_content' => $metavalue, 
        'name' => $metaname, 
        'mode' => "accumulate" 
        };
        
        my $append_metadata = [ "Metadata" => $metadata_attr ];
        my $description_content = $attrHash->{'_content'};
        
        print "Appending metadata to doc.xml\n";
        
        if (ref($description_content)) {
        # got some existing interesting nested content
        push(@$description_content, "    ", $append_metadata ,"\n        ");
        }
        else {
        #description_content is most likely a string such as "\n"
        $attrHash->{'_content'} = [$description_content, "    ", $append_metadata ,"\n" ];
        }
        
        $parser->{'parameters'}->{'metamode'} = "done";
    }       
    else {
        # metamode most likely "done" signifying that it has already found a position to add the metadata to. 
##      print STDERR "**** NOT ACCUMULATE?!? \n";
    }

    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}


sub dxml_start_section
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;

    my $new_depth = scalar(@$contextArray);

    print STDERR "**** START SECTION \n";
    
    if ($new_depth == 1) {
    $parser->{'parameters'}->{'curr_section_depth'} = 1;
    $parser->{'parameters'}->{'curr_section_num'}   = "";
    }

    my $old_depth  = $parser->{'parameters'}->{'curr_section_depth'};
    my $old_secnum = $parser->{'parameters'}->{'curr_section_num'};

    my $new_secnum;

    if ($new_depth > $old_depth) {
    # child subsection
    $new_secnum = "$old_secnum.1";
    }
    elsif ($new_depth == $old_depth) {
    # sibling section => increase it's value by 1
    my ($tail_num) = ($old_secnum =~ m/\.(\d+)$/);
    $tail_num++;
    $new_secnum = $old_secnum;
    $new_secnum =~ s/\.(\d+)$/\.$tail_num/;
    }
    else {
    # back up to parent section => lopp off tail
    $new_secnum = $old_secnum;
    $new_secnum =~ s/\.\d+$//;
    }

    $parser->{'parameters'}->{'curr_section_depth'} = $new_depth;
    $parser->{'parameters'}->{'curr_section_num'}   = $new_secnum;
    
    1;
}

sub edit_xml_file
{
    my $self = shift @_;
    my ($gsdl_cgi, $filename, $start_rules, $rules, $options) = @_;

    # use XML::Rules to add it in (read in and out again)
    my $parser = XML::Rules->new(start_rules     => $start_rules,
                 rules           => $rules, 
                 style           => 'filter',
                                 output_encoding => 'utf8' );

    my $xml_in = "";
    if (!open(MIN,"<$filename")) {
    $gsdl_cgi->generate_error("Unable to read in $filename: $!");
    }
    else {
        # Read all the text in
    my $line;
    while (defined ($line=<MIN>)) {
        $xml_in .= $line;
    }
    close(MIN);
    
    my $MOUT;    
    if (!open($MOUT,">$filename")) {
        $gsdl_cgi->generate_error("Unable to write out to $filename: $!");
    }
    else {
        # Matched lines will get handled by the call backs
##      my $xml_out = "";

        binmode($MOUT,":utf8");
        $parser->filter($xml_in,$MOUT, $options);

#       binmode(MOUT,":utf8");
#       print MOUT $xml_out;
        close($MOUT);       
    }
    }

    # copy across any custom error information that was stored during parsing
    $self->{'error_msg'} = $parser->{'custom_err_msg'} if(defined $parser->{'custom_err_msg'});    
}

sub edit_doc_xml
{
    my $self = shift @_;
    my ($gsdl_cgi, $doc_xml_filename, $metaname, $metavalue, $metapos, $metamode, $opt_secnum, $prevmetavalue) = @_;

    my $info_mess = <<RAWEND;
****************************
  edit_doc_xml()
****************************
doc_xml_filename = $doc_xml_filename
metaname = $metaname
metavalue = $metavalue
metapos = $metapos
metamode = $metamode
opt_secnum = $opt_secnum
prevmetavalue = $prevmetavalue
****************************
RAWEND

    $gsdl_cgi->generate_message($info_mess);
    
    # To monitor which section/subsection number we are in
    my @start_rules = 
    ( 'Section'    => \&dxml_start_section );

    # use XML::Rules to add it in (read in and out again)
    # Set the call back functions
    my @rules = 
    ( _default => 'raw',
      'Metadata'    => \&dxml_metadata,
      'Description' => \&dxml_description,
      'Archive'     => \&dxml_archive); # just for catching errors at end
      
    # Sets the parameters
    my $options = { 'metaname'  => $metaname,
            'metapos'   => $metapos,
            'metavalue' => $metavalue,
            'metamode'  => $metamode,
            'prevmetavalue' => $prevmetavalue };
            
    if (defined $opt_secnum) {
    $options->{'secnum'} = $opt_secnum;
    }

    $self->edit_xml_file($gsdl_cgi,$doc_xml_filename,\@start_rules,\@rules,$options);
}

sub set_archives_metadata_entry
{
    my $self = shift @_;
    my ($gsdl_cgi, $archive_dir, $collect_dir, $collect, $infodbtype, $docid, $metaname, $metapos, $metavalue, $metamode, $prevmetavalue) = @_;
    
    my $info_mess = <<RAWEND;
****************************
  set_archives_metadata_entry()
****************************
archive_dir = $archive_dir
collect_dir = $collect_dir
collect = $collect
infodbtype = $infodbtype
docid = $docid
metaname = $metaname
metapos = $metapos
metavalue = $metavalue
metamode = $metamode
prevmetavalue = $prevmetavalue
****************************
RAWEND

    $gsdl_cgi->generate_message($info_mess);
    
    # Obtain the doc.xml path for the specified docID
    my ($docid_root,$docid_secnum) = ($docid =~ m/^(.*?)(\..*)?$/);

    my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $arcinfo_doc_filename, $docid_root);
    my $doc_xml_file = $doc_rec->{'doc-file'}->[0];
    
    # The $doc_xml_file is relative to the archives, and now let's get the full path
    my $archives_dir = &util::filename_cat($collect_dir,$collect,"archives");    
    my $doc_xml_filename = &util::filename_cat($archives_dir,$doc_xml_file);

    # If we're overriding everything, then $metamode=override combined with $metapos=undefined
    # in which case, we need to remove all metavalues for the metaname at the given (sub)section
    # Thereafter, we will finally be setting the overriding metavalue for this metaname
    if(!defined $metapos && $metamode eq "override") {
    $self->remove_from_doc_xml($gsdl_cgi, &util::filename_cat($archive_dir, $doc_xml_file), $metaname, $metapos, undef, $docid_secnum, $metamode);
    }

    # Edit the doc.xml file with the specified metadata name, value and position.
    # TODO: there is a potential problem here as this edit_doc_xml function 
    # is assuming the simple doc.xml situation where there is only one Section and no SubSections.
    # Running import.pl -groupsize will cause this to have multiple sections in one doc.xml
    
    # dxml_metadata method ignores metapos if metamode anything other than override
    $self->edit_doc_xml($gsdl_cgi,$doc_xml_filename,
            $metaname,$metavalue,$metapos,$metamode,$docid_secnum,$prevmetavalue);

    # return 0; # return 0 for now to indicate no error
    return (defined $self->{'error_msg'}) ? 1 : 0;
}


sub set_archives_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    
    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection
    $self->authenticate_user($username, $collect);
    }

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_set_archives_metadata(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

sub _set_archives_metadata_array
{
    my $self = shift @_;
    
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);

    # look up additional args
    
    my $infodbtype = $self->{'infodbtype'};
    
    my $archive_dir = &util::filename_cat($collect_dir,$collect,"archives");
    
    my $json_str      = $self->{'json'};
    my $doc_array = decode_json $json_str;
    
    
    my $global_status = 0;
    my $global_mess = "";
    
    my @all_docids = ();
    
    foreach my $doc_array_rec ( @$doc_array ) {
    my $status    = -1;
    my $docid     = $doc_array_rec->{'docid'};

    push(@all_docids,$docid);
    
    my $metaname  = $doc_array_rec->{'metaname'};
    if(defined $metaname) {
        
        my $metapos   = $doc_array_rec->{'metapos'}; # don't force undef to 0. Undef has meaning when metamode=override

        my $metamode  = $doc_array_rec->{'metamode'} || $self->{'metamode'};
        my $metavalue = $doc_array_rec->{'metavalue'};
        my $prevmetavalue = $self->{'prevmetavalue'}; # to make this sub behave as _set_archives_metadata
        
        
        if ((!defined $metamode) || ($metamode =~ m/^\s*$/)) {
        # make "accumulate" the default (less destructive, as it won't actually 
        # delete any existing values)
        $metamode = "accumulate";
        }       
        
        $status = $self->set_archives_metadata_entry($gsdl_cgi,$archive_dir, $collect_dir,$collect, $infodbtype,$docid,
                $metaname,$metapos,$metavalue,$metamode,$prevmetavalue);
    } elsif (defined $doc_array_rec->{'metatable'}) { # if no metaname, we expect a metatable
        my $metatable = $doc_array_rec->{'metatable'}; # a subarray, or need to generate an error saying JSON structure is wrong
        
        foreach my $metatable_rec ( @$metatable ) {
        $metaname  = $metatable_rec->{'metaname'};
        my $metamode  = $metatable_rec->{'metamode'} || $doc_array_rec->{'metamode'} || $self->{'metamode'};
        my $metapos = undef;
        my $prevmetavalue = undef;
        my $metavals = $metatable_rec->{'metavals'}; # a sub-subarray
        
        foreach my $metavalue ( @$metavals ) {
            $status = $self->set_archives_metadata_entry($gsdl_cgi,$archive_dir, $collect_dir,$collect,$infodbtype,
                                 $docid,$metaname,$metapos,$metavalue,$metamode,$prevmetavalue);
            
            if($metamode eq "override") { # now, having overridden the metavalue for the first, 
            # need to accumulate subsequent metavals for this metaname, else the just-assigned
            # metavalue for this metaname will be lost
            $metamode = "accumulate";
            }
        }           
        }       
    }
        
    if ($status != 0) {
        # Catch error if set infodb entry failed
        $global_status = $status;
        $global_mess .= "Failed to set metadata key: $docid\n";
        $global_mess .= "Exit status: $status\n";
        $global_mess .= "System Error Message: $!\n";
        $global_mess .= "-" x 20 . "\n";
    }
    }
    
    if ($global_status != 0) {
    $global_mess .= "PATH: $ENV{'PATH'}\n";
    $gsdl_cgi->generate_error($global_mess);
    }
    else {
    my $mess = "set-archives-metadata-array successful: Keys[ ".join(", ",@all_docids)."]\n";
    $gsdl_cgi->generate_ok_message($mess);
    }
}

sub set_archives_metadata_array
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
#    my $gsdlhome  = $self->{'gsdlhome'};

    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    
    $gsdl_cgi->checked_chdir($collect_dir);

    # Obtain the collect dir
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_set_archives_metadata_array(@_);
    
    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

sub _remove_archives_metadata
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
#   my $gsdlhome  = $self->{'gsdlhome'};
    my $infodbtype = $self->{'infodbtype'};
    
    my $site = $self->{'site'};
        
    # Obtain the collect and archive dir   
    my $collect_dir = $gsdl_cgi->get_collection_dir($site); 
    
    my $archive_dir = &util::filename_cat($collect_dir,$collect,"archives");

    # look up additional args
    my ($docid, $docid_secnum) = ($self->{'d'} =~ m/^(.*?)(\..*)?$/);
    
    my $metaname = $self->{'metaname'};
    my $metapos = $self->{'metapos'};

    my $metavalue = $self->{'metavalue'} || undef; # necessary to force fallback to undef here

    # if the user hasn't told us what to delete, not having given a metavalue or metapos,
    # default to deleting the first metavalue for the given metaname
    # Beware that if both metapos AND metavalue are defined, both matches (if any) 
    # seem to get deleted in one single remove_archives_meta action invocation.
    # Similarly, if 2 identical metavalues for a metaname exist and that metavalue is being
    # deleted, both get deleted.
    if(!defined $metapos && !defined $metavalue) {
        $metapos = 0;
    }

    my $metamode = $self->{'metamode'} || undef;

    my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $arcinfo_doc_filename, $docid);

    # This now stores the full pathname
    my $doc_filename = $doc_rec->{'doc-file'}->[0]; 

    my $status = $self->remove_from_doc_xml($gsdl_cgi, &util::filename_cat($archive_dir, $doc_filename), $metaname, $metapos, $metavalue, $docid_secnum, $metamode);
#   my $status = $self->remove_from_doc_xml($gsdl_cgi, &util::filename_cat($archive_dir, $doc_filename), $metaname, $metapos, undef, $docid_secnum);
    
    if ($status == 0) 
    {
        my $mess = "remove-archives-metadata successful: Key[$docid]\n";
        $mess .= "  $metaname";
        $mess .= "->[$metapos]" if (defined $metapos);

        $gsdl_cgi->generate_ok_message($mess);  
    }
    else 
    {
        my $mess .= "Failed to remove archives metadata key: $docid\n";
        $mess .= "Exit status: $status\n";
        $mess .= "System Error Message: $!\n";
        $mess .= "-" x 20 . "\n";
        
        $gsdl_cgi->generate_error($mess);
    }
    
    #return $status; # in case calling functions have a use for this
}

sub remove_archives_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    
    if ($baseaction::authentication_enabled) 
    {
        # Ensure the user is allowed to edit this collection        
        $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect); 
    }

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_remove_archives_metadata(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

sub remove_from_doc_xml
{
    my $self = shift @_;
    my ($gsdl_cgi, $doc_xml_filename, $metaname, $metapos, $metavalue, $secid, $metamode) = @_;
    
    my @start_rules = ('Section' => \&dxml_start_section);
    
    # Set the call-back functions for the metadata tags
    my @rules = 
    ( 
        _default => 'raw',
        'Metadata' => \&rfdxml_metadata
    );
        
    my $parser = XML::Rules->new
    (
        start_rules => \@start_rules,
        rules => \@rules, 
        style => 'filter',
        output_encoding => 'utf8',
#    normalisespaces => 1, # http://search.cpan.org/~jenda/XML-Rules-1.16/lib/XML/Rules.pm
        stripspaces => 2|0|0 # ineffectual
    );
    
    my $status = 0;
    my $xml_in = "";
    if (!open(MIN,"<$doc_xml_filename")) 
    {
        $gsdl_cgi->generate_error("Unable to read in $doc_xml_filename: $!");
        $status = 1;
    }
    else 
    {
        # Read them in
        my $line;
        while (defined ($line=<MIN>)) {
            $xml_in .= $line;
        }
        close(MIN); 

        # Filter with the call-back functions
        my $xml_out = "";

        my $MOUT;
        if (!open($MOUT,">$doc_xml_filename")) {
            $gsdl_cgi->generate_error("Unable to write out to $doc_xml_filename: $!");
            $status = 1;
        }
        else {
            binmode($MOUT,":utf8");
            $parser->filter($xml_in, $MOUT, {metaname => $metaname, metapos => $metapos, metavalue => $metavalue, secid => $secid, metamode => $metamode});
            close($MOUT);       
        }
    }
    return $status;
}

sub rfdxml_metadata
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;

    # For comparisons, toplevel section is indicated by ""
    my $curr_sec_num = $parser->{'parameters'}->{'curr_section_num'} || "";
    my $secid = $parser->{'parameters'}->{'secid'} || "";

    if (!($secid eq $curr_sec_num))
    {
        # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
        return [$tagname => $attrHash];
    }

    if ($parser->{'parameters'}->{'metaname'} eq $attrHash->{'name'})
    {
        if (!defined $parser->{'parameters'}->{'poscount'})
        {
            $parser->{'parameters'}->{'poscount'} = 0;
        }
        else
        {
            $parser->{'parameters'}->{'poscount'}++;
        }
        
        # if overriding (for set-meta) but no metapos, then clear all the meta for this metaname
        if ((defined $parser->{'parameters'}->{'metamode'}) && ($parser->{'parameters'}->{'metamode'} eq "override") && (!defined $parser->{'parameters'}->{'metapos'})) {          
            return [];
        }
    }

    if ((defined $parser->{'parameters'}->{'metapos'}) && ($parser->{'parameters'}->{'metaname'} eq $attrHash->{'name'}) && ($parser->{'parameters'}->{'poscount'} == $parser->{'parameters'}->{'metapos'}))
    {   
        return [];
    }

    if ((defined $parser->{'parameters'}->{'metavalue'}) && ($parser->{'parameters'}->{'metaname'} eq $attrHash->{'name'}) && ($parser->{'parameters'}->{'metavalue'} eq $attrHash->{'_content'}))
    {   
        return [];
    }
    
    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}

sub mxml_metadata
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;
    my $metaname = $parser->{'parameters'}->{'metaname'};
    my $metamode = $parser->{'parameters'}->{'metamode'};

    # Report error if we don't see FileName tag before this
    die "Fatal Error: Unexpected metadata.xml structure. Undefined current_file, possibly encountered Description before FileName" if (!defined($parser->{'parameters'}->{'current_file'}));
    
    # Don't do anything if we are not in the right FileSet
    my $file_regexp = $parser->{'parameters'}->{'current_file'};
    if ($file_regexp =~ /\.\*/) {
    # Only interested in a file_regexp if it specifies precisely one
    # file.  
    # So, skip anything with a .* in it as it is too general
##  print STDERR "@@@@ Skipping entry in metadata.xml where FileName=.* as it is too general\n";
    return [$tagname => $attrHash];
    }
    my $src_file = $parser->{'parameters'}->{'src_file'};
    if (!($src_file =~ /$file_regexp/)) {
    return [$tagname => $attrHash];
    }
##    print STDERR "*** mxl metamode = $metamode\n";

    # Find the right metadata tag and checks if we are going to override it
    my $name_attr = $attrHash->{'name'};
    if (($name_attr eq $metaname) && ($metamode eq "override")) {

    # now metadata.xml functions need to keep track of metapos
    if (!defined $parser->{'parameters'}->{'poscount'}) 
    { 
        $parser->{'parameters'}->{'poscount'} = 0; 
    } 
    else 
    { 
        $parser->{'parameters'}->{'poscount'}++; 
    } 

    # If either the metapos or prevmetavalue is set,
        # get the value and override the current value
    my $metavalue = $parser->{'parameters'}->{'metavalue'};

    if(defined $parser->{'parameters'}->{'prevmetavalue'} && $parser->{'parameters'}->{'prevmetavalue'} eq $attrHash->{'_content'})
    {
        $attrHash->{'_content'} = $metavalue;

        ##  print STDERR "**** overriding metadata.xml\n";
        
        # Don't want it to wipe out any other pieces of metadata
        $parser->{'parameters'}->{'metamode'} = "done";
    }
    elsif(defined $parser->{'parameters'}->{'metapos'} && $parser->{'parameters'}->{'poscount'} == $parser->{'parameters'}->{'metapos'})
    {
        $attrHash->{'_content'} = $metavalue;
        $parser->{'parameters'}->{'metamode'} = "done";
    }
    } 

    # mxml_description will process the metadata if metadata is accumulate, 
    # or if we haven't found the metadata to override

    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}


sub mxml_description
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;
    my $metamode = $parser->{'parameters'}->{'metamode'};    

    # Failed... Report error if we don't see FileName tag before this
    die "Fatal Error: Unexpected metadata.xml structure. Undefind current_file, possiblely encountered Description before FileName" if (!defined($parser->{'parameters'}->{'current_file'}));

    # Don't do anything if we are not in the right FileSet
    my $file_regexp = $parser->{'parameters'}->{'current_file'};
    if ($file_regexp =~ m/\.\*/) {
    # Only interested in a file_regexp if it specifies precisely one
    # file.  
    # So, skip anything with a .* in it as it is too general
    return [$tagname => $attrHash];
    }
    my $src_file = $parser->{'parameters'}->{'src_file'};
    
    if (!($src_file =~ m/$file_regexp/)) {
    return [$tagname => $attrHash];
    }

    # Accumulate the metadata block to the end of the description block
    # Note: This adds metadata block to all description blocks, so if there are 
    # multiple FileSets, it will add to all of them
    if (($metamode eq "accumulate") || ($metamode eq "override")) {

    # if metamode was "override" but get to here then it failed to
    # find an item to override, in which case it should append its 
    # value to the end, just like the "accumulate" mode

    if ($metamode eq "override") {
        print "No metadata value to override.  Switching 'metamode' to accumulate\n";
    }

    # tack a new metadata tag on to the end of the <Metadata>+ block
    my $metaname = $parser->{'parameters'}->{'metaname'};
    my $metavalue = $parser->{'parameters'}->{'metavalue'};
    
    my $metadata_attr = { '_content' => $metavalue, 
                  'name'     => $metaname, 
                  'mode'     => "accumulate" };

    my $append_metadata = [ "Metadata" => $metadata_attr ];
    my $description_content = $attrHash->{'_content'};
    
##  print STDERR "*** appending to metadata.xml\n";

    # append the new metadata element to the end of the current
    # content contained inside this tag
    if (ref($description_content) eq "") {
        # => string or numeric literal
        # this is caused by a <Description> block has no <Metadata> child elements
        # => set up an empty array in '_content'
        $attrHash->{'_content'} = [ "\n" ]; 
        $description_content = $attrHash->{'_content'};
    }

    push(@$description_content,"    ", $append_metadata ,"\n        ");
    $parser->{'parameters'}->{'metamode'} = "done";
    }

    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}


sub mxml_filename
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;

    # Store the filename of the Current Fileset
    # Note: According to http://greenstone.org/dtd/DirectoryMetadata/1.0/DirectoryMetadata.dtd
    # FileName tag must come before Description tag
    $parser->{'parameters'}->{'current_file'} = $attrHash->{'_content'};

    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}


sub mxml_fileset
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;

    # Initilise the current_file
    # Note: According to http://greenstone.org/dtd/DirectoryMetadata/1.0/DirectoryMetadata.dtd
    # FileName tag must come before Description tag
    $parser->{'parameters'}->{'current_file'} = "";

    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}

sub mxml_directorymetadata
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;

    # if we haven't processed the metadata when we reach the end of metadata.xml
    # it's because there's no particular FileSet element whose FileName matched
    # In which case, add a new FileSet for this FileName
    my $metamode = $parser->{'parameters'}->{'metamode'};
    if($metamode ne "done") {
    
    if ($metamode eq "override") {
        print "No metadata value to override.  Switching 'metamode' to accumulate\n";
    }

    # If we get to here and metamode is override, this means there 
    # was no existing value to overide => treat as an append operation
    
    # Create a new FileSet element and append to DirectoryMetadata
    # <FileSet>
    # <FileName>src_file</FileName>
    # <Description>
    # <Metadata mode="" name="">metavalue</Metadata>
    # </Description>
    # </FileSet>
    my $src_file = $parser->{'parameters'}->{'src_file'};
    my $metaname = $parser->{'parameters'}->{'metaname'};
    my $metavalue = $parser->{'parameters'}->{'metavalue'};
    my $metadata_attr = { 
        '_content' => $metavalue, 
        'name' => $metaname, 
        'mode' => "accumulate" 
    };
    my $append_metadata = [ "Metadata" => $metadata_attr ];
    my $description_attr->{'_content'} = [ "\n\t\t   ", $append_metadata, "\n\t\t"];
    my $description_element = [ "Description" => $description_attr ];

    #_content is not an attribute, it's special and holds the children of this element
    # including the textnode value embedded in this element if any.
    my $filename_attr = {'_content' => $src_file};
    my $filename_element = [ "FileName" => $filename_attr ];

    my $fileset_attr = {};
    $fileset_attr->{'_content'} = [ "\n\t\t", $filename_element,"\n\t\t",$description_element ,"\n\t" ];
    my $fileset = [ "FileSet" => $fileset_attr ]; #my $fileset = [ "FileSet" => {} ];
    
    
    # get children of dirmeta, and push the new FileSet element onto it
    print "Appending metadata to metadata.xml\n";
    my $dirmeta_content = $attrHash->{'_content'};
    if (ref($dirmeta_content)) {
        # got some existing interesting nested content
        #push(@$dirmeta_content, "    ", $fileset ,"\n        ");
        push(@$dirmeta_content, "\t", $fileset ,"\n");
    }
    else {
        #description_content is most likely a string such as "\n"
        #$attrHash->{'_content'} = [$dirmeta_content, "    ", $fileset ,"\n" ];
        $attrHash->{'_content'} = [$dirmeta_content, "\t", $fileset ,"\n" ];
    }   

    $parser->{'parameters'}->{'metamode'} = "done";
    }
    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}


sub edit_metadata_xml
{
    my $self = shift @_;
    my ($gsdl_cgi, $metadata_xml_filename, $metaname, $metapos, $metavalue, $metamode, $src_file, $prevmetavalue) = @_;

    # Set the call-back functions for the metadata tags
    my @rules = 
    ( _default => 'raw',
          'FileName' => \&mxml_filename,
      'Metadata' => \&mxml_metadata,
      'Description' => \&mxml_description,
          'FileSet' => \&mxml_fileset,
      'DirectoryMetadata' => \&mxml_directorymetadata);

    # use XML::Rules to add it in (read in and out again)
    my $parser = XML::Rules->new(rules => \@rules, 
                 style => 'filter',
                                 output_encoding => 'utf8',
                 stripspaces => 2|0|0); # http://search.cpan.org/~jenda/XML-Rules-1.16/lib/XML/Rules.pm

    if (!-e $metadata_xml_filename) {
    
        if (open(MOUT,">$metadata_xml_filename")) {
            
            my $src_file_re = &util::filename_to_regex($src_file);
            # shouldn't the following also be in the above utility routine??
            # $src_file_re =~ s/\./\\./g;
        
            print MOUT "<?xml version=\"1.0\"?>\n";
            print MOUT "<DirectoryMetadata>\n";
            print MOUT " <FileSet>\n";
            print MOUT "  <FileName>$src_file_re</FileName>\n";
            print MOUT "  <Description>\n";
            print MOUT "  </Description>\n";
            print MOUT " </FileSet>\n";
            print MOUT "</DirectoryMetadata>\n";

            close(MOUT);
        }
        else {
            $gsdl_cgi->generate_error("Unable to create $metadata_xml_filename: $!");
        }
    }
    
    
    my $xml_in = "";
    if (!open(MIN,"<$metadata_xml_filename")) {
        $gsdl_cgi->generate_error("Unable to read in $metadata_xml_filename: $!");
    }
    else {
        # Read them in
        my $line;
        while (defined ($line=<MIN>)) {
            $xml_in .= $line;
        }
        close(MIN); 

        # Filter with the call-back functions
        my $xml_out = "";

        my $MOUT;
        if (!open($MOUT,">$metadata_xml_filename")) {
            $gsdl_cgi->generate_error("Unable to write out to $metadata_xml_filename: $!");
        }
        else {
            binmode($MOUT,":utf8");

            # Some wise person please find out how to keep the DTD and encode lines in after it gets filtered by this XML::Rules
            # At the moment, I will just hack it!
            #my $header_with_utf8_dtd = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
            #$header_with_utf8_dtd .= "<!DOCTYPE DirectoryMetadata SYSTEM \"http://greenstone.org/dtd/DirectoryMetadata/1.0/DirectoryMetadata.dtd\">";
            #$xml_out =~ s/\<\?xml\sversion\=\"1.0\"\?\>/$header_with_utf8_dtd/;
            #print MOUT $xml_out;

            $parser->filter($xml_in, $MOUT, { metaname => $metaname,
                              metapos => $metapos,
                      metavalue => $metavalue,
                      metamode => $metamode,
                      src_file => $src_file,
                      prevmetavalue => $prevmetavalue,
                      current_file => undef} );
            close($MOUT);       
        }
   }
}


sub set_import_metadata
{
    my $self = shift @_;
    
    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    
    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection
    $self->authenticate_user($username, $collect);
    }

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);
 
    $self->_set_import_metadata(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
    
}

sub set_import_metadata_array
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
#    my $gsdlhome  = $self->{'gsdlhome'};

    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    
    $gsdl_cgi->checked_chdir($collect_dir);

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_set_import_metadata_array(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);

}


sub _set_import_metadata_array
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};

    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    
    # look up additional args
    
    my $infodbtype = $self->{'infodbtype'};
    
    my $archive_dir = &util::filename_cat($collect_dir,$collect,"archives");    
    my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
    
    my $json_str = $self->{'json'};
    my $doc_array = decode_json $json_str;
    
    my $global_status = 0;
    my $global_mess = "";
    
    my @all_docids = ();
    
    foreach my $doc_array_rec ( @$doc_array ) 
    {
    my $status = -1;
    my $docid = $doc_array_rec->{'docid'};
    
    my ($docid_root,$docid_secnum);
    if(defined $docid) {    
        ($docid_root,$docid_secnum) = ($docid =~ m/^(.*?)(\..*)?$/);    
        # as yet no support for setting subsection metadata in metadata.xml
        if ((defined $docid_secnum) && ($docid_secnum !~ m/^\s*$/)) {
        $gsdl_cgi->generate_message("*** docid: $docid. No support yet for setting import metadata at subsections level.\n");
        next; # skip this docid in for loop
        }
    }

    push(@all_docids,$docid); # docid_root rather
    
    my $metaname = $doc_array_rec->{'metaname'};
    if (defined $metaname) {
        my $metamode = $doc_array_rec->{'metamode'} || $self->{'metamode'};
        my $metavalue = $doc_array_rec->{'metavalue'};
        $metavalue =~ s/&lt;(.*?)&gt;/<$1>/g;

        if ((!defined $metamode) || ($metamode =~ m/^\s*$/)) {
        # make "accumulate" the default (less destructive, as won't actually 
        # delete any existing values)
        $metamode = "accumulate";
        }

        # adding metapos and prevmetavalue support to import_metadata subroutines
        my $metapos   = $doc_array_rec->{'metapos'}; # don't force undef to 0. Undef has meaning when metamode=override
        my $prevmetavalue = $self->{'prevmetavalue'};

        $self->set_import_metadata_entry($gsdl_cgi, $arcinfo_doc_filename, $infodbtype, $docid_root, $metaname, $metapos, $metavalue, $metamode, $prevmetavalue, $collect, $collect_dir); # at this point, docid_root = docid
        
    } elsif (defined $doc_array_rec->{'metatable'}) { # if no metaname, we expect a metatable
        my $metatable = $doc_array_rec->{'metatable'}; # a subarray, or need to generate an error saying JSON structure is wrong
        
        foreach my $metatable_rec ( @$metatable ) {
        $metaname  = $metatable_rec->{'metaname'}; 
        my $metamode  = $metatable_rec->{'metamode'} || $doc_array_rec->{'metamode'} || $self->{'metamode'};
        if ((!defined $metamode) || ($metamode =~ m/^\s*$/)) {
            # make "accumulate" the default (less destructive, as won't actually 
            # delete any existing values)
            $metamode = "accumulate";
        }

        # No support for metapos and prevmetavalue in the JSON metatable substructure
        my $metapos = undef; 
        my $prevmetavalue = undef;
        my $metavals = $metatable_rec->{'metavals'}; # a sub-subarray
        
        foreach my $metavalue ( @$metavals ) {
            $metavalue =~ s/&lt;(.*?)&gt;/<$1>/g;

            $self->set_import_metadata_entry($gsdl_cgi, $arcinfo_doc_filename, $infodbtype, $docid_root, $metaname, $metapos, $metavalue, $metamode, $prevmetavalue, $collect, $collect_dir); # at this point, docid_root = docid
            if($metamode eq "override") { # now, having overridden the first metavalue of the metaname, 
            # need to accumulate subsequent metavals for this metaname, else the just-assigned
            # metavalue for this metaname will be lost
            $metamode = "accumulate";
            }
        }
        }
    }       
    }

    # always a success message
    my $mess = "set-archives-metadata-array successful: Keys[ ".join(", ",@all_docids)."]\n";
    $gsdl_cgi->generate_ok_message($mess);
}

# always returns true (1)
sub set_import_metadata_entry
{
    my $self = shift @_;
    my ($gsdl_cgi, $arcinfo_doc_filename, $infodbtype, $docid, $metaname, $metapos, $metavalue, $metamode, $prevmetavalue, $collect, $collect_dir) = @_;

    my $info_mess = <<RAWEND;
****************************
  set_import_metadata_entry()
****************************
collect = $collect
collect_dir = $collect_dir
infodbtype = $infodbtype
arcinfo_doc_filename = $arcinfo_doc_filename
docid = $docid
metaname = $metaname
metapos = $metapos
metavalue = $metavalue
metamode = $metamode
prevmetavalue = $prevmetavalue
****************************
RAWEND

    $gsdl_cgi->generate_message($info_mess);

    # import works with metadata.xml which can have inherited metadata
    # so setting or removing at a metapos can have unintended effects for a COMPLEX collection
    # (a collection that has or can have inherited metadata). Metapos has expected behaviour for
    # a SIMPLE collection, which is one that doesn't have inherited metadata. Assume caller knows 
    # what they're doing if they provide a metapos.
    if(defined $metapos) {
    print STDERR "@@@@ WARNING: metapos defined.\n";
    print STDERR "@@@@ Assuming SIMPLE collection and proceeding to modify the import meta at $metapos.\n";
    }

    # Obtain where the metadata.xml is from the archiveinfo-doc.gdb file
    # If the doc oid is not specified, we assume the metadata.xml is next to the specified "f"
    my $metadata_xml_file;
    my $import_filename = undef;
    
    if (defined $docid) {
    # my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $arcinfo_doc_filename, $docid);

    # This now stores the full pathname
    $import_filename = $doc_rec->{'src-file'}->[0]; 
    } else { # only for set_import_meta, not the case when calling method is set_import_metadata_array
         # as the array version of the method doesn't support the -f parameter yet
    my $import_file  = $self->{'f'};
    $import_filename = &util::filename_cat($collect_dir,$collect,$import_file);
    }
    
    # figure out correct metadata.xml file [?]
    # Assuming the metadata.xml file is next to the source file
    # Note: This will not work if it is using the inherited metadata from the parent folder
    my ($import_tailname, $import_dirname) = File::Basename::fileparse($import_filename);
    my $metadata_xml_filename = &util::filename_cat($import_dirname,"metadata.xml");
    
    # If we're overriding everything, then $metamode=override combined with $metapos=undefined
    # in which case, we need to remove all metavalues for the metaname at the given (sub)section
    # Thereafter, we will finally be able to set the overriding metavalue for this metaname
    if(!defined $metapos && $metamode eq "override") {
##  print STDERR "@@@ REMOVING all import metadata for $metaname\n";
    $self->remove_from_metadata_xml($gsdl_cgi, $metadata_xml_filename, $metaname, $metapos, undef, $import_tailname, $metamode); # we're removing all values, so metavalue=undef

    }

    # Edit the metadata.xml
    # Modified by Jeffrey from DL Consulting
    # Handle the case where there is one metadata.xml file for multiple FileSets
    # The XML filter needs to know whether it is in the right FileSet
    # TODO: This doesn't fix the problem where the metadata.xml is not next to the src file.
    # TODO: This doesn't handle the common metadata (where FileName doesn't point to a single file)
    $self->edit_metadata_xml($gsdl_cgi, $metadata_xml_filename, $metaname, 
                 $metapos, $metavalue, $metamode, $import_tailname, $prevmetavalue);
    #return 0;
    return $metadata_xml_filename;
}

sub _remove_import_metadata
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
#   my $gsdlhome  = $self->{'gsdlhome'};
    my $infodbtype = $self->{'infodbtype'};
    
    # Obtain the collect dir
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");
    my $archive_dir = &util::filename_cat($collect_dir,$collect,"archives");

    # look up additional args
    my $docid = $self->{'d'};
    if ((!defined $docid) || ($docid =~ m/^\s*$/)) 
    {
        $gsdl_cgi->generate_error("No docid (d=...) specified.\n");
    }
    
    my $metaname = $self->{'metaname'};
    my $metapos = $self->{'metapos'};
    my $metavalue = $self->{'metavalue'};
    if(defined $metavalue) {
        $metavalue =~ s/&lt;(.*?)&gt;/<$1>/g;
    } elsif (!defined $metapos) { # if given no metavalue or metapos to delete, default to deleting the 1st
        $metapos = 0;
    }
    my $metamode = $self->{'metamode'} || undef;

    # import works with metadata.xml which can have inherited metadata
    # so setting or removing at a metapos can have unintended effects for a COMPLEX collection
    # (a collection that has or can have inherited metadata). Metapos has expected behaviour for
    # a SIMPLE collection, which is one that doesn't have inherited metadata. Assume caller knows 
    # what they're doing if they provide a metapos.
    if(defined $metapos) {
        print STDERR "@@@@ WARNING: metapos defined.\n";
        print STDERR "@@@@ Assuming SIMPLE collection and proceeding to modify the import meta at $metapos.\n";
    }
    
    # Obtain where the metadata.xml is from the archiveinfo-doc.gdb file
    # If the doc oid is not specified, we assume the metadata.xml is next to the specified "f"
    my $metadata_xml_file;
    my $import_filename = undef;
    if (defined $docid) 
    {
        my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
        my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $arcinfo_doc_filename, $docid);

        # This now stores the full pathname
        $import_filename = $doc_rec->{'src-file'}->[0]; 
    }

    if((!defined $import_filename) || ($import_filename =~ m/^\s*$/))
    {
        $gsdl_cgi->generate_error("There is no metadata\n");
    }
    
    # figure out correct metadata.xml file [?]
    # Assuming the metadata.xml file is next to the source file
    # Note: This will not work if it is using the inherited metadata from the parent folder
    my ($import_tailname, $import_dirname) = File::Basename::fileparse($import_filename);
    my $metadata_xml_filename = &util::filename_cat($import_dirname,"metadata.xml");
    
    $self->remove_from_metadata_xml($gsdl_cgi, $metadata_xml_filename, $metaname, $metapos, $metavalue, $import_tailname, $metamode); # metamode has no meaning for removing meta, but is used by set_meta when overriding All
    
    my $mess = "remove-import-metadata successful: Key[$docid] -> $metadata_xml_filename\n";
    $mess .= "  $metaname";
    $mess .= " = $metavalue\n";
    
    $gsdl_cgi->generate_ok_message($mess);

    #return $status; # in case calling functions have a use for this
}

sub remove_import_metadata
{
    my $self = shift @_;
    
    my $username = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    
    if ($baseaction::authentication_enabled) {
        # Ensure the user is allowed to edit this collection        
        $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);
    
    $self->_remove_import_metadata(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);

}

sub remove_from_metadata_xml
{
    my $self = shift @_;
    my ($gsdl_cgi, $metadata_xml_filename, $metaname, $metapos, $metavalue, $src_file, $metamode) = @_;
    # metamode generally has no meaning for removing meta, but is used by set_meta 
    # when overriding all metavals for a metaname, in which case remove_meta is called with metamode

    # Set the call-back functions for the metadata tags
    my @rules = 
    ( 
        _default => 'raw',
        'Metadata' => \&rfmxml_metadata,
        'FileName' => \&mxml_filename
    );
        
    my $parser = XML::Rules->new
    (
        rules => \@rules, 
        style => 'filter',
        output_encoding => 'utf8',
     #normalisespaces => 1,
            stripspaces => 2|0|0 # ineffectual
    );
    
    my $xml_in = "";
    if (!open(MIN,"<$metadata_xml_filename")) 
    {
        $gsdl_cgi->generate_error("Unable to read in $metadata_xml_filename: $!");
    }
    else 
    {
        # Read them in
        my $line;
        while (defined ($line=<MIN>)) {
            $xml_in .= $line;
        }
        close(MIN); 

        # Filter with the call-back functions
        my $xml_out = "";

        my $MOUT;
        if (!open($MOUT,">$metadata_xml_filename")) {
            $gsdl_cgi->generate_error("Unable to write out to $metadata_xml_filename: $!");
        }
        else {
            binmode($MOUT,":utf8");
            $parser->filter($xml_in, $MOUT, {metaname => $metaname, metapos => $metapos, metavalue => $metavalue, src_file => $src_file, metamode => $metamode, current_file => undef});
            close($MOUT);       
        }
    }
}

sub rfmxml_metadata
{
    my ($tagname, $attrHash, $contextArray, $parentDataArray, $parser) = @_;

    # metadata.xml does not handle subsections

    # since metadata.xml now has to deal with metapos, we keep track of the metadata position
    if (($parser->{'parameters'}->{'src_file'} eq $parser->{'parameters'}->{'current_file'}) 
        && $parser->{'parameters'}->{'metaname'} eq $attrHash->{'name'})
    {
        if (!defined $parser->{'parameters'}->{'poscount'})
        {
            $parser->{'parameters'}->{'poscount'} = 0;
        }
        else
        {
            $parser->{'parameters'}->{'poscount'}++;
        }

        # if overriding but no metapos, then clear all the meta for this metaname
        if ((defined $parser->{'parameters'}->{'metamode'}) && ($parser->{'parameters'}->{'metamode'} eq "override") && (!defined $parser->{'parameters'}->{'metapos'})) {
            return [];
        }
    
        if ((defined $parser->{'parameters'}->{'metapos'}) && ($parser->{'parameters'}->{'poscount'} == $parser->{'parameters'}->{'metapos'}))
        {
            return [];
        }

        if ((defined $parser->{'parameters'}->{'metavalue'}) && ($attrHash->{'_content'} eq $parser->{'parameters'}->{'metavalue'}))
        {
            return [];
        }       
    }

    # RAW is [$tagname => $attrHash] not $tagname => $attrHash!!
    return [$tagname => $attrHash];
}

sub _remove_live_metadata
{
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
#    my $gsdlhome  = $self->{'gsdlhome'};
    my $infodbtype = $self->{'infodbtype'};

    # Obtain the collect dir
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);

    
    # look up additional args
    my $docid     = $self->{'d'};
    if ((!defined $docid) || ($docid =~ m/^\s*$/)) {
      $gsdl_cgi->generate_error("No docid (d=...) specified.");
    }
    
    # Generate the dbkey
    my $metaname  = $self->{'metaname'};
    my $dbkey = "$docid.$metaname";

    # To people who know $collect_tail please add some comments
    # Obtain the live gdbm_db path 
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, "live-$collect_tail", $index_text_directory);

    # Remove the key
    my $cmd = "gdbmdel \"$infodb_file_path\" \"$dbkey\"";
    my $status = system($cmd);
    if ($status != 0) {
        # Catch error if gdbmdel failed
    my $mess = "Failed to set metadata key: $dbkey\n";
    
    $mess .= "PATH: $ENV{'PATH'}\n";
    $mess .= "cmd = $cmd\n";
    $mess .= "Exit status: $status\n";
    $mess .= "System Error Message: $!\n";

    $gsdl_cgi->generate_error($mess);
    }
    else {
    $gsdl_cgi->generate_ok_message("DB remove successful: Key[$metaname]");
    }

}

sub remove_live_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $gsdlhome  = $self->{'gsdlhome'};
    
    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_remove_live_metadata(@_);

    $self->unlock_collection($username, $collect);
}

sub remove_metadata
{
    my $self = shift @_;

    my $where = $self->{'where'};
    if(!$where) {
    $self->remove_index_metadata(@_); # call the full version of set_index_meta for the default behaviour
    return;
    }

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};

    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    # check which directories need to be processed, specified in $where as 
    # any combination of import|archives|index|live
    if($where =~ m/import/) {
    $self->_remove_import_metadata(@_);     
    }
    if($where =~ m/archives/) {
    $self->_remove_archives_metadata(@_);       
   } 
    if($where =~ m/index/) {
    $self->_remove_index_metadata(@_);      
    }

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

# the internal version, without authentication
sub _remove_index_metadata
{    
    my $self = shift @_;

    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
#    my $gsdlhome  = $self->{'gsdlhome'};
    my $infodbtype = $self->{'infodbtype'};
    
    # Obtain the collect dir
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");

        # look up additional args
    my $docid     = $self->{'d'};
    if ((!defined $docid) || ($docid =~ m/^\s*$/)) {
      $gsdl_cgi->generate_error("No docid (d=...) specified.");
    }
    my $metaname  = $self->{'metaname'};
    my $metapos   = $self->{'metapos'};
    my $metavalue = $self->{'metavalue'} || undef; # necessary to force fallback to undef here

    # To people who know $collect_tail please add some comments
    # Obtain the path to the database
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, $collect_tail, $index_text_directory);

    # Read the docid entry
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $infodb_file_path, $docid);

    # Check to make sure the key does exist
    if (!defined ($doc_rec->{$metaname})) {
        $gsdl_cgi->generate_error("No metadata field \"" . $metaname . "\" in the specified document: [" . $docid . "]");
    }

    # Obtain the specified metadata pos
    # if no metavalue or metapos to delete, default to deleting the 1st value for the metaname
    if(!defined $metapos && !defined $metavalue) {
        $metapos = 0;
    }
    

    # consider check key is defined before deleting?
    # Loop through the metadata array and ignore the specified position
    my $filtered_metadata = [];
    my $num_metadata_vals = scalar(@{$doc_rec->{$metaname}});    
    for (my $i=0; $i<$num_metadata_vals; $i++) {
    my $metaval = shift(@{$doc_rec->{$metaname}});

    if (!defined $metavalue && $i != $metapos) {
        push(@$filtered_metadata,$metaval);
    }
    
    if(defined $metavalue && !($metavalue eq $metaval))
    {
        push(@$filtered_metadata,$metaval);
    }
    }
    $doc_rec->{$metaname} = $filtered_metadata;

    ## Use the dbutil set_entry method instead of assuming the database is gdbm
    my $status = &dbutil::set_infodb_entry($infodbtype, $infodb_file_path, $docid, $doc_rec);

    if ($status != 0) {
    my $mess = "Failed to set metadata key: $docid\n";
    
    $mess .= "PATH: $ENV{'PATH'}\n";
    $mess .= "Exit status: $status\n";
    $mess .= "System Error Message: $!\n";

    $gsdl_cgi->generate_error($mess);
    }
    else {
    my $mess = "DB set (with item deleted) successful: Key[$docid]\n";
    $mess .= "  $metaname";
    $mess .= "->[$metapos]" if (defined $metapos);

    $gsdl_cgi->generate_ok_message($mess);
    }

    #return $status; # in case calling functions have a use for this
}

sub remove_index_metadata
{
    my $self = shift @_;

    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
#    my $gsdlhome  = $self->{'gsdlhome'};
    
    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection    
    $self->authenticate_user($username, $collect); #&authenticate_user($gsdl_cgi, $username, $collect);
    }

    # Obtain the collect dir
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    ## my $collect_dir = &util::filename_cat($gsdlhome, "collect");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);

    $self->_remove_index_metadata(@_);

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}


# Was trying to reused the codes, but the functions need to be broken
# down more before they can be reused, otherwise there will be too
# much overhead and duplicate process...
sub insert_metadata
{
    my $self = shift @_;
    
    my $username  = $self->{'username'};
    my $collect   = $self->{'collect'};
    my $gsdl_cgi  = $self->{'gsdl_cgi'};
    my $gsdlhome  = $self->{'gsdlhome'};
    my $infodbtype = $self->{'infodbtype'};
    
    # If the import metadata and gdbm database have been updated, we
    # need to insert some notification to warn user that the the text
    # they see at the moment is not indexed and require a rebuild.
    my $rebuild_pending_macro = "_rebuildpendingmessage_";

    if ($baseaction::authentication_enabled) {
    # Ensure the user is allowed to edit this collection
    $self->authenticate_user($username, $collect);
    }

    # Obtain the collect and archive dir   
    my $site = $self->{'site'};
    my $collect_dir = $gsdl_cgi->get_collection_dir($site);
    ##my $collect_dir = &util::filename_cat($gsdlhome, "collect");
    my $archive_dir = &util::filename_cat($collect_dir,$collect,"archives");

    # Make sure the collection isn't locked by someone else
    $self->lock_collection($username, $collect);
    
    # Check additional args
    my $docid = $self->{'d'};
    if (!defined($docid)) {
    $gsdl_cgi->generate_error("No document id is specified: d=...");
    } 
    my $metaname = $self->{'metaname'};
    if (!defined($metaname)) {
    $gsdl_cgi->generate_error("No metaname is specified: metadataname=...");
    } 
    my $metavalue = $self->{'metavalue'};
    if (!defined($metavalue) || $metavalue eq "") {
    $gsdl_cgi->generate_error("No metavalue or empty metavalue is specified: metadataname=...");
    } 
    # make "accumulate" the default (less destructive, as won't actually 
    # delete any existing values)
    my $metamode = "accumulate";

    # metapos/prevmetavalue were never before used in this subroutine, so set them to undefined
    my $metapos   = undef;
    my $prevmetavalue = undef;

    #=======================================================================#
    # set_import_metadata [START]
    #=======================================================================#
    # Obtain where the metadata.xml is from the archiveinfo-doc.gdb file
    # If the doc oid is not specified, we assume the metadata.xml is next to the specified "f"
    my $metadata_xml_file;
    my $arcinfo_doc_filename = &dbutil::get_infodb_file_path($infodbtype, "archiveinf-doc", $archive_dir);
    my $archive_doc_rec = &dbutil::read_infodb_entry($infodbtype, $arcinfo_doc_filename, $docid);
    
    # This now stores the full pathname
    my $import_filename = $archive_doc_rec->{'src-file'}->[0];
    
    # figure out correct metadata.xml file [?]
    # Assuming the metadata.xml file is next to the source file
    # Note: This will not work if it is using the inherited metadata from the parent folder
    my ($import_tailname, $import_dirname) 
    = File::Basename::fileparse($import_filename);
    my $metadata_xml_filename = &util::filename_cat($import_dirname,"metadata.xml");

    # Shane's escape characters
    $metavalue = pack "U0C*", unpack "C*", $metavalue;
    $metavalue =~ s/\,/&#44;/g;
    $metavalue =~ s/\:/&#58;/g;
    $metavalue =~ s/\|/&#124;/g;
    $metavalue =~ s/\(/&#40;/g;
    $metavalue =~ s/\)/&#41;/g;
    $metavalue =~ s/\[/&#91;/g;
    $metavalue =~ s/\\/&#92;/g;
    $metavalue =~ s/\]/&#93;/g;
    $metavalue =~ s/\{/&#123;/g;
    $metavalue =~ s/\}/&#125;/g;
    $metavalue =~ s/\"/&#34;/g;
    $metavalue =~ s/\`/&#96;/g;
    $metavalue =~ s/\n/_newline_/g;

    # Edit the metadata.xml
    # Modified by Jeffrey from DL Consulting
    # Handle the case where there is one metadata.xml file for multiple FileSets
    # The XML filter needs to know whether it is in the right FileSet
    # TODO: This doesn't fix the problem where the metadata.xml is not next to the src file.
    # TODO: This doesn't handle the common metadata (where FileName doesn't point to a single file)
    $self->edit_metadata_xml($gsdl_cgi, $metadata_xml_filename, $metaname,
                 $metapos, $metavalue, $metamode, $import_tailname, $prevmetavalue);
    #=======================================================================#
    # set_import_metadata [END]
    #=======================================================================#


    #=======================================================================#
    # set_metadata (accumulate version) [START]
    #=======================================================================#
    # To people who know $collect_tail please add some comments
    # Obtain path to the database
    my $collect_tail = $collect;
    $collect_tail =~ s/^.*[\/\\]//;
    my $index_text_directory = &util::filename_cat($collect_dir,$collect,"index","text");
    my $infodb_file_path = &dbutil::get_infodb_file_path($infodbtype, $collect_tail, $index_text_directory);

    # Read the docid entry
    my $doc_rec = &dbutil::read_infodb_entry($infodbtype, $infodb_file_path, $docid);

    # Protect the quotes
    $metavalue =~ s/\"/\\\"/g;

    # Adds the pending macro
    my $macro_metavalue = $rebuild_pending_macro . $metavalue;

    # If the metadata doesn't exist, create a new one
    if (!defined($doc_rec->{$metaname})){    
    $doc_rec->{$metaname} = [ $macro_metavalue ];
    }
    # Else, let's acculumate the values
    else {
        push(@{$doc_rec->{$metaname}},$macro_metavalue);
    }

    ## Use the dbutil set_entry method instead of assuming the database is gdbm
    my $status = &dbutil::set_infodb_entry($infodbtype, $infodb_file_path, $docid, $doc_rec);

    if ($status != 0) {
        # Catch error if gdbmget failed
    my $mess = "Failed to set metadata key: $docid\n";
    
    $mess .= "PATH: $ENV{'PATH'}\n";
    $mess .= "Exit status: $status\n";
    $mess .= "System Error Message: $!\n";

    $gsdl_cgi->generate_error($mess);
    }
    else {
    my $mess = "insert-metadata successful: Key[$docid]\n";
    $mess .= "  [In metadata.xml] $metaname";
    $mess .= " = $metavalue\n";
    $mess .= "  [In database] $metaname";
    $mess .= " = $macro_metavalue\n";
    $mess .= "  The new text has not been indexed, rebuilding collection is required\n";
        $gsdl_cgi->generate_ok_message($mess);
    }    
    #=======================================================================#
    # set_metadata (accumulate version) [END]
    #=======================================================================#

    # Release the lock once it is done
    $self->unlock_collection($username, $collect);
}

1;