object "position list" class array type float rank 1 shape 2 items 3 data follows
   0 0
   1 1
   2 2
attribute "name" string "position list"
attribute "dep" string "positions"
#
object "edge list" class array type int rank 0 items 3 data follows
        0         1         2
attribute "name" string "edge list"
attribute "ref" string "positions"
#
object "polyline list" class array type int rank 0 items 1 data follows
        0
attribute "name" string "polyline list"
attribute "ref" string "edges"
#
object "Polyline" class field
component "positions" value "position list"
component "edges" value "edge list"
component "polylines" value "polyline list"
attribute "name" string "Polyline"
#
end
