[OGSA-BES-WG] BES schema/wsdl

[Michel Drescher]

Peter G. Lane wrote:
>> Exactly - all the data types, including WSDL message types, (complexType
>> & elements) that potentially will be generated as objects, should all go
>> to the schema, WSDL document is only for messages and portTypes. I think
>> that is a better organization.
> 
> You're misunderstanding me. I'm not advocating moving all the schema
> entities into the .xsd file. I'm still advocating keeping those schema
> entities that are only relevant to the WSDL (i.e. message types and
> elements) inside the WSDL document. No other WSDL or schema needs to
> import those entities. The only reason I think we need a separate .xsd
> file is because there are schema entities that are shared between WSDL
> documents (i.e. Activity port type). Also, since the WSDL has a schema
> section, you can't say that the WSDL is only for port types and
> messages. That's just a personal preference. Why would the WSDL spec
> creators put it in there if not to allow you to put schema entities in
> the WSDL document?

You both are right, actually, as both approaches are valid.

However, when developing WSDL, tools often are limited in not supporting
the leading edge versions like, say, SOAP 1.2, WSDL 2.0 or whatever. So,
you often end up messing around by hand in those WSDL files. And then
separate XML Schema files get very handy in that they allow you to validate
your XML elements.

So far, I haven't seen any XML hacking tool that not only validates WSDL
against the WSDL XML Schema, but also all XML Schema (or any other like
RelaxNG for that matter) that's inside the wsdl:types element.

Finally, probably a personal preference, one should keep XML Schema
documents (everything in wsdl:types) and XML instance documents separate,
and not mix them into one document.

Using this approach helped us a great deal in ByteIO to find some possibly
treacherous bugs in the ByteIO schemas.

Just my 2 cents.

Cheers,
Michel

-- 
Michel <dot> Drescher <at> uk <dot> fujitsu <dot> com
Fujitsu Laboratories of Europe
+44 20 8606 4834