Web Services Description Language
A bunch of pointers for learning more about WSDL :
- Microsoft's WSDL Specification
- IBM alphaWorks WSDL Toolkit
- IBM developerWorks Web Services
- XML Cover Pages - WSDL
- SOAP + UDDI + WSDL = Web Services, by Ken Sall
- WSDL processing with XSLT, by Uche Ogbuji
- Supercharging WSDL with RDF, by Uche Ogbuji