2.2.5.3 guid

The guid simple type specifies the unique identifier.<1>

 <s:simpleType name="guid">
   <s:restriction base="s:string">
     <s:pattern value="[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}" />
   </s:restriction>
 </s:simpleType>