> Hmm if it is an error for the client to request a stylesheet, 
> does that mean that the stylesheet parameter is not needed in 
> requestType ?

We've tried very hard from day 1 to try to keep the specifications for
SRU, SRW etc. so that the only real difference is the protocol binding
(SRU binds to HTTP GET, SRW binds to SOAP over HTTP). This is reflected
in the WSDL and XSD (we have one schema defining the types for both, one
wsdl defining the PortTypes the variance only happens in that we have
different wsdl for the two bindings). This has resulted in the odd
artefact in the spec. (e.g. SRW has no real need of the echoed...Request
mechanism).

Matthew