a basic retrieval service for plain XML documents which may just be raw XML. the config fiel must specify the xslt file to use to produce table of contents. nodeIDs are assumed to be docname.scope.tagname.id, ora subset of that. structure retrieval runs the stylesheet over the doc and returns the result. content retrieve reads in the doc and locates teh seciton and returns that. metadata retrieve: for doc level meta it looks in the docList that was found in the config file, for section level meta, it only returns Title, and this is just some of teh text of teh node (actually not implemented yet). should be subclassed to deal with specific formats
