Greenstone can search across several different collections as though they were
one. This is done by specifying a list of other collections to be searched along with the current one. Under "Design Sections", click "Cross-Collection Search".
The Cross-Collection Search view shows a checklist of available collections. The
current collection is ticked and cannot be deselected. To add another
collection to be searched in parallel, click it in the list (click again to
remove it). If only one collection is selected, there is no cross-collection
searching.
If the individual collections do not have the same indexes (including subcollection partitions and language partitions) as each other, cross-collection searching will not work properly. The user will only be able to search using indexes common to all collections.
For further details, see Chapter 1 of the Greenstone Developer's Guide.
