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.