code: public final void removeRelationshipsWithTag(@Nonnull String tag) {
          getRelationships().stream()
                  .map(RelationshipView::getRelationship)
                  .filter(r -> r.hasTag(tag))
                  .forEach(this::remove);
      }
docs: Removes all {@link Relationship}s that have the given tag from this view.
  
  @param tag a tag