This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
You can tell by the binding section of WSDL. Check for SOAP binding.
WSDL is not specific to SOAP. It supports non-SOAP web services.
Actually WSDL 2.0 offers better support for RESTful web services since it accepts all HTTP request methods (not only POST and GET)