//Artefact:ModelClass /com /sphenon /modelling /uml /UMLExtension

//Artefact:ModelAttribute /com /sphenon /modelling /uml /UMLExtension /ExtensionId

//Artefact:ModelOperation /com /sphenon /modelling /uml /UMLExtension /isToBeMergedWith(UMLExtension):boolean

//Artefact:ModelOperation /com /sphenon /modelling /uml /UMLExtension /mergeWith(UMLExtension):void

//Artefact:ModelOperation /com /sphenon /modelling /uml /UMLExtension /checkMerge(Object,Object,String):boolean

//Artefact:ModelAssociationEnd /com /sphenon /modelling /uml /UMLExtension /BaseExtension

//Artefact:ModelAssociationEnd /com /sphenon /modelling /uml /UMLExtension /Extension