Terms: Common Query Language (1,600), query language (2,440,000), query languages (470,000), cql query (526), search retrieval via url (151),
Standards at the Library of Congress
SRU: Search/Retrieval via URL -- SRU, CQL and ZeeRex
Terms: namespace (13,500,000), search clause (2,470), search term (27,500,000), index name (360,000), schemas (7,480,000), metadata formats (102,000),
Terms: backus naur form (395,000), MARC 21 (255,000), Z39.50 (842,000), CQL (138,000), Dublin core (1,700,000), MarcXML (51,400), ZeeRex (737),