code: private List<Class<? extends RelationshipInterface>> getRelationClassCandidatesForRelType(final String relType) {
  
  		List<Class<? extends RelationshipInterface>> candidates = new ArrayList();
  
  		for (final Class<? extends RelationshipInterface> candidate : getRelationshipEntities().values()) {
  
  			Relation rel = instantiate(candidate);
  
  			if (rel == null) {
  				continue;
  			}
  
  			if (rel.name().equals(relType)) {
  				candidates.add(candidate);
  			}
  
  		}
  
  		return candidates;
  
  	}
docs: Return a list of all relation entity classes filtered by relationship
  type.
  
  @param relType
  @return classes