Document Centric SOAP - Message Validation and API/Toolkits

[Meh-Lit Kim]

Hi All,

I'd like to use SOAP 1.2 messaging in a document-centric fashion.

Does anyone know -

1. What to do to validate an incoming SOAP message ?

Do people write an XML schema for their application's SOAP messages
which necessarily needs to reference the SOAP XML Schemas and then
use something like a validating SAX parser to parse the incoming
SOAP message, thereby doing away with WSDL ?

2. Is there a suitable (and preferably open-source) toolkit that
allows for document-centric SOAP messaging ?

I've come across DocSoapXDK from CommerceOne. What are people's
experience with this toolkit ?

Thanks,
/Meh