System.ComponentModel.Composition 4.0.0.0 System.Object Do not create metadata by using any of the keys in this class, except to deliberately interact with the composition system. Other uses will cause unpredictable behavior. Contains static metadata keys used by the composition system. Field 4.0.0.0 System.String To be added. Specifies the metadata key created by the composition system to mark a part with a unique identifier. Field 4.0.0.0 System.String To be added. Specifies the metadata key created by the composition system to mark a generic contract. Field 4.0.0.0 System.String To be added. Specifies the metadata key created by the composition system to mark generic parameters. Field 4.0.0.0 System.String To be added. Specifies the metadata key created by the composition system to mark an import source. Field 4.0.0.0 System.String To be added. Specifies the metadata key created by the composition system to mark an IsGenericPart method. Field 4.0.0.0 System.String To be added. Specifies the metadata key created by the composition system to mark a part with a creation policy.