Merge pull request #400 from handrews/ipv6

Update ipv6 RFC reference.

Author: handrews

jsonschema-validation.xml

@@ -2,10 +2,10 @@
 <!DOCTYPE rfc SYSTEM "rfc2629.dtd" [
 <!ENTITY RFC1034 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.1034.xml">
 <!ENTITY RFC2119 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.2119.xml">
-<!ENTITY RFC2373 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.2373.xml">
 <!ENTITY RFC2673 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.2673.xml">
 <!ENTITY RFC3339 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.3339.xml">
 <!ENTITY RFC3986 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.3986.xml">
+<!ENTITY RFC4291 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.4291.xml">
 <!ENTITY RFC5322 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.5322.xml">
 <!ENTITY RFC6570 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.6570.xml">
 <!ENTITY RFC6901 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.6901.xml">
@@ -943,8 +943,8 @@
                     </t>
                     <t>
                         A string instance is valid against this attribute if it is a valid
-                        representation of an IPv6 address as defined in <xref
-                        target="RFC2373">RFC 2373, section 2.2</xref>.
+                        representation of an IPv6 address as defined in
+                        <xref target="RFC4291">RFC 4291, section 2.2</xref>.
                     </t>
                 </section>
 
@@ -1034,10 +1034,10 @@
 
         <references title="Informative References">
             &RFC1034;
-            &RFC2373;
             &RFC2673;
             &RFC3339;
             &RFC3986;
+            &RFC4291;
             &RFC6570;
             &RFC6901;
             &RFC7159;