2.2.5.36 wscn:KeywordNsExtensionPatternType

The wscn:KeywordNsExtensionPatternType type restricts built-in type xs:NMTOKEN (as specified in [XMLSCHEMA1] and [XMLSCHEMA2]) with a pattern based on a regular expression that allows extensible keywords.

 <xs:simpleType name="KeywordNsExtensionPatternType">
     <xs:restriction base="xs:NMTOKEN">
        <xs:pattern value="\w+:[\w_\-\.]+"/>
     </xs:restriction>
 </xs:simpleType>