| class  | AccountID | This class represents the identification of an Account. | 
| class  | ContractID | This class represents the identification of a Contract. | 
| class  | CredentialID | This class represents the identification of an Credential. | 
| class  | DataClayInstanceID | This class represents the identification of a dataClay instance. | 
| class  | DataContractID | This class represents the identification of a Data Contract. | 
| class  | DataSetID | This class represents the identification of a DataSet. | 
| class  | ECAID |  | 
| class  | EventMessageID |  | 
| class  | EventObjsMeetConditionID |  | 
| class  | ExecutionEnvironmentID | This class represents the identification of a ExecutionEnvironment. | 
| class  | ImplementationID | This class represents the identification of an Implementation. | 
| class  | InterfaceID | This class represents the identification of an Interface. | 
| class  | MetaClassID | This class represents the identification of an Argument. | 
| class  | NamespaceID | This class represents the identification of a Namespace. | 
| class  | ObjectID | This class represents the identification of an Object. | 
| class  | OperationID | This class represents the identification of an Operation. | 
| class  | PropertyID | This class represents the identification of a Property. | 
| class  | QualitativeRegistryID | This class represents the identification of a Feature. | 
| class  | ResourceID | This class represents the identification of a Resource. | 
| class  | SessionID | This class represents the identification of a Session. | 
| class  | StorageLocationID | This class represents the identification of a StorageLocation. |