super( element, thePropDefn ); assert thePropDefn.getType( ) instanceof DimensionPropertyType;
super( element, memberRef ); assert memberRef.getMemberDefn( ).getType( ) instanceof DimensionPropertyType;
	public DimensionHandle( DesignElementHandle element,			ElementPropertyDefn thePropDefn )	{		super( element, thePropDefn );		assert thePropDefn.getType( ) instanceof DimensionPropertyType;	}