James McGovern on SOA
James observes that there is far more to a contract than simple WSDL. Contracts also define:
- Message interchange formats defined using XML Schema
- Message Exchange Patterns (MEPs) defined using WSDL
- Capabilities and requirements defined using WS-Policy
- BPEL may be used as a business-process level contract for aggregating multiple services
James has a great blog - I hope he starts blogging again soon.