docs: public boolean includesDefinedInContent() {
  
          if ((m_types == null) || m_types.isEmpty()) {
              return true;
          }
          Iterator<CmsRelationType> itTypes = m_types.iterator();
          while (itTypes.hasNext()) {
              CmsRelationType type = itTypes.next();
              if (type.isDefinedInContent()) {
                  return true;
              }
          }
          return false;
      }