Within the scope of the instantiating Namespace, InstanceID opaquely and uniquely identifies an instance of this class. In ...

Within the scope of the instantiating Namespace, InstanceID opaquely and uniquely identifies an instance of this class. In order to ensure uniqueness within the NameSpace, the value of InstanceID shall be constructed using the following 'preferred' algorithm: 
: 
Where and are separated by a colon ':', and where shall include a copyrighted, trademarked or otherwise unique name that is owned by the business entity creating/defining the InstanceID, or is a registered ID that is assigned to the business entity by a recognized global authority. (This is similar to the _ structure of Schema class names.) In addition, to ensure uniqueness, shall not contain a colon (':'). The first colon to appear in InstanceID shall appear between and . is chosen by the organizational entity and should not be re-used to identify different underlying (real-world) elements. 
For DMTF defined instances, shall be set to 'CIM'.