JSON Hyper-Schema: remove JSON Pointer reference

Author: awwright

jsonschema-hyperschema.xml

@@ -7,7 +7,6 @@
 <!ENTITY rfc4287 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.4287.xml">
 <!--<!ENTITY rfc5226 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.5226.xml">-->
 <!ENTITY rfc5988 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.5988.xml">
-<!ENTITY rfc6901 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.6901.xml">
 <!ENTITY rfc6570 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.6570.xml">
 <!ENTITY rfc7231 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.7231.xml">
 <!ENTITY html5 SYSTEM "http://xml.resource.org/public/rfc/bibxml4/reference.W3C.CR-html5-20140731.xml">
@@ -911,7 +910,6 @@ GET /foo/
             &rfc3986;
             &rfc4287;
             &rfc6570;
-            &rfc6901;
             <reference anchor="json-schema">
                 <front>
                     <title>JSON Schema: core definitions and terminology</title>