+ SKETCHPLUGIN_EXPORT virtual boost::shared_ptr<ModelAPI_Feature> addFeature(std::string theID);
+
+ /// Returns the number of sub-elements
+ SKETCHPLUGIN_EXPORT virtual int numberOfSubs() const;
+
+ /// Returns the sub-feature by zero-base index
+ SKETCHPLUGIN_EXPORT virtual boost::shared_ptr<ModelAPI_Feature>
+ subFeature(const int theIndex) const;
+
+ /// Returns the sub-feature unique identifier in this composite feature by zero-base index
+ SKETCHPLUGIN_EXPORT virtual int subFeatureId(const int theIndex) const;
+
+ /// Construction result is allways recomuted on the fly
+ SKETCHPLUGIN_EXPORT virtual bool isPersistentResult() {return false;}
+
+protected: