+ /// Attribute name for reverse flag.
+ inline static const std::string& REVERSE()
+ {
+ static const std::string ATTR_ID("reverse");
+ return ATTR_ID;
+ }
+
+ /// Attribute name for coincident point.
+ inline static const std::string& COINCIDENT_POINT()
+ {
+ static const std::string ATTR_ID("coincident_point");
+ return ATTR_ID;
+ }
+
+ /// Attribute name for axis.
+ inline static const std::string& AXIS()
+ {
+ static const std::string ATTR_ID("axis");
+ return ATTR_ID;
+ }
+
+ /// Attribute name for angle.
+ inline static const std::string& ANGLE()
+ {
+ static const std::string ATTR_ID("angle");
+ return ATTR_ID;
+ }
+
+ inline static const std::string& PLANE1()
+ {
+ static const std::string ATTR_ID("plane1");
+ return ATTR_ID;
+ }
+
+ inline static const std::string& PLANE2()
+ {
+ static const std::string ATTR_ID("plane2");
+ return ATTR_ID;
+ }
+
+