The queryables are determined by the names of Lucene indexes; if there's a GeoNetwork Lucene index by that name, you can query on it. The behavior you describe suggests to me there is no 'ResourceIdentifier' index
steve
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Stephen M. Richard
Section Chief, Geoinformatics
Arizona Geological Survey
416 W. Congress St., #100
Tucson, Arizona, 85701 USA
Phone:
Office: (520) 209-4127
Reception: (520) 770-3500
FAX: (520) 770-3505
email: steve.richard@anonymised.com