Quoting <a href="http:&#x2F;&#x2F;json-schema.org&#x2F;latest&#x2F;json-schema-core.html" rel="nofollow">http:&#x2F;&#x2F;json-schema.org&#x2F;latest&#x2F;json-schema-core.html</a>:  
&quot;This Internet-Draft will expire on August 3, 2013.&quot;