QUERY_REWRITE(3mp)

NAME
query_rewrite - Metaproxy RPN Query Rewrite Module

DESCRIPTION

This module allows Z39.50 Type-1 queries to be arbitrarily rewritten using an XSLT stylesheet to specify the rewrite rules. This can be useful for several purposes, including the provision of index aliases (e.g. BIB-1 access-point 1, personal name, rewritten to access-point 1003, author); and protecting fragile Z39.50 servers from attribute combinations that cause them problems.

The Type-1 query is translated into an XML representation, transformed by an XSLT stylesheet whose path is specified in the filter configuration's <xslt> element, then translated back into a Type-1 query.

### Describe the XML representation.

SCHEMA

    # Metaproxy XML config file schemas
    #
    #   Copyright (C) Index Data
    #   See the LICENSE file for details.
    namespace mp = "http://indexdata.com/metaproxy"
    filter_query_rewrite =
      attribute type { "query_rewrite" },
      attribute id { xsd:NCName }?,
      attribute name { xsd:NCName }?,
      element mp:xslt {
            attribute stylesheet { xsd:string }
      }?,
      element mp:charset {
            attribute from { xsd:string }?,
            attribute to { xsd:string }?
      }?

EXAMPLES

A typical configuration looks like this:

       <filter type="query_rewrite">
        <xslt stylesheet="pqf2pqf.xsl">
       </filter>

SEE ALSO

metaproxy(1)

COPYRIGHT

Copyright (C) 2005-2023 Index Data

AUTHORS

Index Data