code: public CmsRelationFilter filterType(CmsRelationType type) {
  
          CmsRelationFilter filter = (CmsRelationFilter)clone();
          filter.m_types.add(type);
          return filter;
      }
docs: Returns an extended filter with the given type restriction.<p>
  
  @param type the relation type to filter
  
  @return an extended filter with the given type restriction