def dispatch void infer(Entity element, IJvmDeclaredTypeAcceptor acceptor, boolean isPreIndexingPhase) {
   	    acceptor.accept(   			
   		buildClass(element)
   	    ).initializeLater([type |
		// do something
	    ])
   	}
   	def buildClass(Entity element) {
	   val result = element.toClass(element.name)   			   		
	   result.setDocumentation("Generated JPA entity")
           ??????? how to add an annotation ?????
	   result
   	}

acceptor.accept(
			e.toClass( e.fullyQualifiedName ) [
				annotations += e.toAnnotation("org.eclipse.xtext.example.domainmodel.Entity")
]