+ /// Adds the new reference to the end of the list by the naming name of the selected shape
+ /// The type of shape is taken from the current selection type if the given is empty
+ virtual void append(const std::string theNamingName, const std::string& theType = "") = 0;
+
+ /// Removes the last element in the list
+ virtual void removeLast() = 0;
+
+ /// Removes the elements from the list.
+ /// \param theIndices a list of indices of elements to be removed
+ virtual void remove(const std::set<int>& theIndices) = 0;
+
+ /// Returns the number of selection attributes in the list