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

Within the scope of the instantiating Namespace, InstanceID opaquely and uniquely identifies an instance of this class. To ensure uniqueness within the NameSpace, the value of InstanceID should be constructed using the following \"preferred\" algorithm: 
: 
Where  and  are separated by a colon (:), and where  must include a copyrighted, trademarked, or otherwise unique name that is owned by the business entity that is creating or defining the InstanceID or that is a registered ID assigned to the business entity by a recognized global authority. (This requirement is similar to the _ structure of Schema class names.) In addition, to ensure uniqueness,  must not contain a colon (:). When using this algorithm, the first colon to appear in InstanceID must appear between  and . 
 is chosen by the business entity and should not be reused to identify different underlying (real-world) elements. If the above \"preferred\" algorithm is not used, the defining entity must assure that the resulting InstanceID is not reused across any InstanceIDs produced by this or other providers for the NameSpace of this instance. 
For DMTF-defined instances, the \"preferred\" algorithm must be used with the  set to CIM.