2.2.5.1 Guid

The guid type represents a valid globally unique identifier (GUID).<1>

 <xsd:simpleType name="guid">
   <xsd:restriction base="xsd:string">
     <xsd: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}\}"/>
   </xsd:restriction>
 </xsd:simpleType>