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    <h3>WADL (Web Application Description Language)</h3> <p>WADL is a standard to describe HTTP-based web applications, typically REST web services. So WADL can be seen as a REST equivalent of WSDL 1.1.</p> <h3>WSDL (Web Services Description Language)</h3> <p>WSDL 2.0 can be used to describe REST Web services and thus competes with WADL. But it has a wider scope.</p> <h3>XRD (eXtensible Resource Descriptor)</h3> <p>Quoting <a href="http://hueniverse.com/xrd/" rel="noreferrer">this blog</a> post from Eran Hammer-Lahav (<em>a frequent contributor to OAuth, Discovery, XRD, and other emerging community-driven specifications and standards</em> - and Director of Standards Development at Yahoo!):</p> <blockquote> <p>XRD is a simple generic format for describing resources. Resource descriptor documents provide machine-readable information about resources (resource metadata) for the purpose of promoting interoperability, and assist in interacting with unknown resources that support known interfaces.</p> <p>For example, a web page about an upcoming meeting can provide in its descriptor document the location of the meeting organizer’s free/busy information to potentially negotiate a different time. The descriptor for a social network profile page can identify the location of the user’s address book as well as accounts on other sites. A web service implementing an API protocol can advertise which of the protocol’s optional components are supported.</p> </blockquote> <h3>Summary</h3> <p>So, while WSDL 2.0 competes with WADL as <em>REST Web Service description languages</em> (WDL 2.0 has more but lets forget that for now), XRD is a <em>metadata discovery format</em> for any URI (OpenID discovery being one of the primary use case). XRD (which has its roots in the Identity community) looks different.</p>
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    1. PODifference between WSDL 2.0, WADL & XRD?
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    1. USPascal Thivent
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    1. PODifference between WSDL 2.0, WADL & XRD?
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    1. COThanks for responding. Can you explain further how XRD is different then WADL? Thanks.
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    2. COAt the end of the day, what's the difference between a discovery format and and descriptive language? Discovery format sounds like a superset of a descriptive language.
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    3. COWADL is not a standard to be more precise
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