Add UUID (not in URN) format

Author: handrews

jsonschema-validation.xml

@@ -8,6 +8,7 @@
 <!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 RFC3987 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.3987.xml">
+<!ENTITY RFC4122 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.4122.xml">
 <!ENTITY RFC4291 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.4291.xml">
 <!ENTITY RFC4329 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.4329.xml">
 <!ENTITY RFC4648 SYSTEM "http://xml.resource.org/public/rfc/bibxml/reference.RFC.4648.xml">
@@ -682,10 +683,22 @@
                                 Reference (either an IRI or a relative-reference),
                                 according to <xref target="RFC3987"/>.
                             </t>
+                            <t hangText="uuid:">
+                                A string instance is valid against this attribute if it is a valid
+                                string representation of a UUID, according to <xref target="RFC4122"/>.
+                            </t>
                         </list>
+                    </t>
+                    <t>
                         Note that all valid URIs are valid IRIs, and all valid URI References are
                         also valid IRI References.
                     </t>
+                    <t>
+                        Note also that the "uuid" format is for plain UUIDs, not UUIDs in URNs.  An example
+                        is "f81d4fae-7dec-11d0-a765-00a0c91e6bf6".  For UUIDs as URNs, use the "uri" format,
+                        with a "pattern" regular expression of "^urn:uuid:" to indicate the URI scheme and
+                        URN namespace.
+                    </t>
                 </section>
 
                 <section title="uri-template">
@@ -1069,6 +1082,7 @@
             &RFC3339;
             &RFC3986;
             &RFC3987;
+            &RFC4122;
             &RFC4291;
             &RFC4648;
             &RFC5322;