An Ad hoc query request specifies an ad hoc query. An Ad hoc query request specifies a query string as defined by [RS] in the queryString attribute The response includes a RegistryObjectList which has zero or more RegistryObjects that match the query specified in AdhocQueryRequest. The following lines define the XML syntax for Clause. Gets the actual content (not metadata) specified by the ObjectRefList The GetContentResponse will have no sub-elements if there were no errors. The actual contents will be in the other payloads of the message. Abstract Base type for all types of Notifications. An ActionType that notifies the recipient by providing light weight references to the RegistryObjects of interest. Client must retrieve the objects separately if needed. An ActionType that notifies the recipient by providing the actual RegistryObjects of interest..