+ static const std::string MY_TO_OFFSET_ID("to_offset");
+ return MY_TO_OFFSET_ID;
+ }
+
+ /// Attribute name of an object from which the extrusion grows.
+ inline static const std::string& FROM_OBJECT_ID()
+ {
+ static const std::string MY_FROM_OBJECT_ID("from_object");
+ return MY_FROM_OBJECT_ID;
+ }
+
+ /// attribute name of extrusion offset
+ inline static const std::string& FROM_OFFSET_ID()
+ {
+ static const std::string MY_FROM_OFFSET_ID("from_offset");
+ return MY_FROM_OFFSET_ID;