2.2.5.44 ser:guid

The guid simple type represents a GUID.

 <xs:simpleType name="guid">
   <xs:restriction base="xsd:string">
     <xs:pattern value="[\da-fA-F]{8}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{12}" />
   </xs:restriction>
 </xs:simpleType>