+ <validator id="GeomValidators_Different" parameters="center,major_axis_point"/>
+ <validator id="SketchPlugin_DifferentPointReference" parameters="center_ref,major_axis_point_ref"/>
+ <validator id="GeomValidators_Different" parameters="start_point,end_point"/>
+ <validator id="SketchPlugin_DifferentPointReference" parameters="start_point_ref,end_point_ref"/>