virtual std::shared_ptr<ModelAPI_AttributeRefAttr> refattr(const std::string& theID) = 0;
/// Returns the attribute that contains list of references to features
virtual std::shared_ptr<ModelAPI_AttributeRefList> reflist(const std::string& theID) = 0;
virtual std::shared_ptr<ModelAPI_AttributeRefAttr> refattr(const std::string& theID) = 0;
/// Returns the attribute that contains list of references to features
virtual std::shared_ptr<ModelAPI_AttributeRefList> reflist(const std::string& theID) = 0;