+ static const std::string POINT_ATTR_X("x");
+ return POINT_ATTR_X;
+ }
+ /// attribute name for Y coordinate
+ inline static const std::string& Y()
+ {
+ static const std::string POINT_ATTR_Y("y");
+ return POINT_ATTR_Y;
+ }
+ /// attribute name for Z coordinate
+ inline static const std::string& Z()
+ {
+ static const std::string POINT_ATTR_Z("z");
+ return POINT_ATTR_Z;