+ <literal>cql_pqf</literal> metaproxy filter.
+ </para>
+ <para>
+ This module supports the following SRU extra parameters:
+ <variablelist>
+ <varlistentry>
+ <term>x-target</term>
+ <listitem>
+ <para>
+ Specifies backend Z39.50 target.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>x-max-sockets</term>
+ <listitem>
+ <para>
+ Specifies maximum number of sockets to use for a Z39.50 backend
+ client (for one given target host/db).
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>x-session-id</term>
+ <listitem>
+ <para>
+ Allow a user-defined session ID to be attached to filter
+ log that follows sru_z3950. The ID is present in the
+ log files and not available to the SRU webservice. In order
+ to log material out via SRU, the x-log-enable may be used
+ instead.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>x-log-enable</term>
+ <listitem>
+ <para>
+ Controls whether log is to be collected for filters that
+ sru_z3950. Log data is extra response data's log element.
+ A value of 1 enables logging; other value disables
+ logging (default).
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </para>