Using the
    <cql2rpn>l2rpn.txt</cql2rpn>
    YAZ Frontend Virtual
    Hosts option, one can configure
    the YAZ Frontend CQL-to-PQF
    converter, specifying the interpretation of various
    CQL
    indexes, relations, etc. in terms of Type-1 query attributes.
    
   
For example, using server-side CQL-to-PQF conversion, one might query a zebra server like this:
     
     yaz-client localhost:9999
     Z> querytype cql
     Z> find text=(plant and soil)
     
    and - if properly configured - even static relevance ranking can be performed using CQL query syntax:
     
     Z> find text = /relevant (plant and soil)
     
    
    By the way, the same configuration can be used to
    search using client-side CQL-to-PQF conversion:
    (the only difference is querytype cql2rpn
    instead of
    querytype cql, and the call specifying a local
    conversion file)
    
     
     yaz-client -q local/cql2pqf.txt localhost:9999
     Z> querytype cql2rpn
     Z> find text=(plant and soil)
     
    
Exhaustive information can be found in the Section CQL to RPN conversion in the YAZ manual.