You can modify the file content class and add any attributes you want ( http://ez.no/doc/ez_publish/technical_manual/3_8/concepts_and_basics/content_management/class_attributes ). Searching on specific attributes is possible through the advancedsearch view ( http://ez.no/doc/ez_publish/technical_manual/3_8/features/search_engine ).
Also take a look at:
http://ez.no/doc/ez_publish/technical_manual/3_8/reference/modules/content/fetch_functions/search
http://ez.no/products/ez_publish/documentation/customization/components/search/custom_search_box http://ez.no/products/ez_publish/documentation/customization/components/search/templates
Thanks! This is great! To take it a little further, I'd like to display these attributes' values to my users when they log in to the intranet.
I added a checkbox attribute to the class File, and ticked the box in the admin_panel. But that attribute's value doesn't appear in the document listing in the intranet.