//! Adds a new sub-document by the identifier, or returns existing one if it is already exist
MODEL_EXPORT virtual boost::shared_ptr<ModelAPI_Document> subDocument(std::string theDocID);
//! Adds a new sub-document by the identifier, or returns existing one if it is already exist
MODEL_EXPORT virtual boost::shared_ptr<ModelAPI_Document> subDocument(std::string theDocID);