Include the CMMN 1.1 Case Model XML-Schema in the same namespace. Include the CMMN 1.1 Diagram Interchange (DI) schema definitions is the root element of ALL CMMN elements. It is used as a container for CMMN elements that might be re-used. tDefinitions defines the type of element "definitions". import is the root element for all imports in CMMN definitions.