3.2.4.4 Allocate Extended GUID Range Sub-Response Processing

The client MAY request this range of unique Extended GUIDs (section 2.2.1.7) from the server. If the client uses these Extended GUIDs in subsequent Put Changes sub-requests (section 2.2.2.1.4), a server compliant with this specification can store data more efficiently than one operating with client-allocated Extended GUIDs.