DLF,  11th April 2006   Slide 13
OpenSearch to SRU Ladder
*Full SRU compliance
*Basic SRU compliance
*SRU Response advertised in OpenSearch Description
*OpenSearch with cql query as extension param
*OpenSearch with cql indexes as extension params
*OpenSearch with SRU param names, ATOM/RSS
       response and no CQL
*OpenSearch with arbitrary param names
*UnAPI/OpenURL ?  (no search, just retrieve)