The GM_LineFeature_t type exposes the following members.
List of attributes associated with feature (pointer to GM_AttrValueCharPtr_t/GM_AttrValueIntPtr_t array) (Read-Only use the SetAttrList() member function to set new list)
Line render style (symbol and font)
List of points that make up the line (global coordinates when getting, native when adding feature)
Optional list of elevations for each point in line. If present, must have *mNumPoints* values