[Gmsh] Points from extruded lines

[Cade Perkins]

I am aware that one can get coordinates of points using the following 
syntax:
   coords[] = Point{pointID};

I would like to get the points of a line (for example, from a line 
generated by an extrusion).  I want to avoid having to use hard coded 
entity IDs.  The following syntax does not work:
   pointIDs = Line{lineID};

Is there a general syntax for getting such metadata from other types of 
entities, or is the point coordinates just a special implementation?


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