[Zope] Problem of Catalog "Find items to ZCatalog"

Hi, In the management view of a Catalog (ex. /Catalog), there is a tab named "Find items to ZCatalog". In that tab, there is a field "Find objects of type:". The options listed there were retrieved from the "factory" of a ZClass. (The "add list name" field, a good feature for people who are not native speakers of English.). I doubt that what "Find items to ZCatalog" actually searched is the meta_type of the objects not the value of "add list name" in its ZClass. Because I have to identify these two in order to find my items to ZCalalog. Is that true? Iap, Singuan