Why doesn't REST utilize WSDLs, unlike SOAP?

Question

For SOAP web services there is a specification which all request/responses must follow. This specification is in the form of a WSDL document. However for REST web services,

Answer 1

There are bunch of ways to define a RESTful API just like WSDL for SOAP:

• Google Discovery service format.
• Mashery IODocs.
• WADL.
• Swagger.
• Apiary.

You can find more info here on my blog post.