- The <literal>sru_z3950</literal> metaproxy filter transforms valid
- SRU/GET or SRU/SOAP requests to Z3950 requests, and wraps the
- recieved hit counts and XML records into suitable SRU response messages.
+ The <literal>sru_z3950</literal> Metaproxy filter transforms valid
+ SRU GET/POST/SOAP requests to Z3950 requests, and wraps the
+ received hit counts and XML records into suitable SRU response messages.
+ </para>
+ <para>
+ Multiple database elements defining the names of the accepted
+ databases are allowed in the configuration file. Each
+ of them must contain their own explain record, or must be empty.
+ Notice that explain
+ records come in SRU and Z39.50 flavors, and this filter requires
+ the SRU version. See the
+ <ulink url="&url.zeerex.explain;">ZeeReX Explain</ulink>
+ standard pages and the
+ <ulink url="&url.sru.explain;">SRU Explain</ulink> pages
+ for more information.
+ </para>
+ <para>
+ All Z39.50 packages and all HTTP packages that do not resolve to
+ one configured database name are passed unaltered to the next
+ filters on the route.
+ </para>
+ <para>
+ The SRU <literal>explain</literal> operation is supported,
+ returning either the absolute minimum required by the standard, or
+ a full pre-defined ZeeReX explain record.