code: public List<Relationship> getRelatedRelationships() {
          final List<Relationship> relatedRelationships = new LinkedList<Relationship>();
          for (final Relationship r : relationships) {
              if (r.getType() == RelationshipType.REFER_TO) {
                  relatedRelationships.add(r);
              }
          }
          return relatedRelationships;
      }
docs: Gets a list of related relationships for the topic.