Validation with encodingStyle set fails

Dear All,

I am having a problem validating a SOAP message. Validation of SOAP headers
and the payload are fine EXCEPT when I include 'encodingStyle' attribute on
the immediate child element of the SOAP Body. For example, I load the
schemas I want to use into a schema cache, in this case the schemas are :-

-  envelope.xsd (the SOAP Envelope schema - attached)
-  the schema for the Authentication header namespace
-  the schema for the Payload namespace

Everything validates correctly, and if I deliberately invalidate any part of
the message the validator spots it :-

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Header>
    <ns1:Authentication xmlns:ns1="some-uri" soap:mustUnderstand="1">
      <ns1:UserID>userid</ns1:UserID>
      <ns1:Pwd>password</nugas:Pwd>
    </ns1:Authentication>
  </soap:Header>
  <soap:Body>
    <ns2:Payload xmlns:ns2="urn:Payload">
      ...
    </ns2:Payload>
  </soap:Body>
</soap:Envelope>

However, as soon as I add the soap:encoding attribute :

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Header>
    <ns1:Authentication xmlns:ns1="some-uri" soap:mustUnderstand="1">
      <ns1:UserID>userid</ns1:UserID>
      <ns1:Pwd>password</nugas:Pwd>
    </ns1:Authentication>
  </soap:Header>
  <soap:Body>
    <ns2:Payload xmlns:ns2="urn:Payload"
         soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
      ...
    </ns2:Payload>
  </soap:Body>
</soap:Envelope>

This validation error occurs :

'The attribute '{http://schemas.xmlsoap.org/soap/envelope/}encodingStyle' on
this element is not defined in the DTD/Schema.'

When I step through the process (I am using a SAX parser) the error actually
occurs on the SOAP Body element, that is, not even the element that contains
the encodingStyle attribute ??

Has anyone got a clue why this is and how I can fix it ??

(Note: If I remove the SOAP envelope schema from the schema cache SAX
reports a validation error because there is no schema for the root node of
the document)


Regards

Fraser.

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