Once designing a new type, you don't have to start from scratch.
Point2D type, defined in the previous chapters.
It has two members,
TYPE Point2D x AS SINGLE y AS SINGLE END TYPE
Once you will need to create 3D point, the obvious approach would be to do it this way:
TYPE Point3D x AS SINGLE y AS SINGLE z AS SINGLE END TYPE
The advantage of this copy-paste approach is that it is straightforward, but once you would add something to
Point2D, it would need to be promoted to
Let's have a look at two different approaches creating new type based on an existing one.