- The <literal>sru_z3950</literal> filter does only process SRU
- GET/POST/SOAP explain requests in a very crude fashion, returning
- the absolute minimum required by the standard. Full ZeeReX
- explain support is added by including the
- <literal>zeerex_explain</literal> filter before the
- <literal>sru_z3950</literal> filter.
+ The <literal>sru_z3950</literal> filter processes also SRU
+ GET/POST/SOAP explain requests, returning
+ either the absolute minimum required by the standard, or a full
+ pre-defined ZeeReX explain record.
+ 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 on the correct explain syntax.
+ SRU scan requests are not supported yet.