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Inclusion
Sometimes you wish to re-use the elements of existing type, but you need them at specific location.
Using the inclusion mechanism, you can specify where will the element be included.
In our case, creating Point3D would be as done as:
TYPE Point3D
Point2D
z AS SINGLE
END TYPE
In this case, x and y will be placed before z in the UDT memory.
Should you need to have them after z, just put the included type on different place:
TYPE Point3D
z AS SINGLE
Point2D
END TYPE
Now z goes first, and x and y follow.