[jebblue]

WSDL describes a pact between a client and a server so they can't screw it up. Comparing WSDL to WADL would make sense. JSON just describes objects in compact notation. Comparing JSON to XML would make sense when XML is only used to describe objects and nothing more. WSDL and WADL and HTML are all XML derivatives. WSDL and WADL could never exist or HTML for that matter if trying to use JSON to describe them since that's not what JSON was designed for.

[mtts]

WSDL is an object notation for objects that describe what a web service should do. This could just as well be done in JSON. It would be marginally less verbose, too :-)

Oh, and it's perfectly feasible to translate a well formed HTML document into some sort of JSON object. After all, HTML is just a set of tags with values, no?