/**
  * Overridden to checks that a {@link DiagramElementMapping} is owned by a {@link
  * DiagramDescription}.
  *
  * <p>{@inheritDoc}
  */
 public boolean apply(DiagramElementMapping diagramElementMapping) {
   return diagramDescription.getAllEdgeMappings().contains(diagramElementMapping)
       || diagramDescription.getAllNodeMappings().contains(diagramElementMapping)
       || diagramDescription.getAllContainerMappings().contains(diagramElementMapping);
 }