Trying to define a Rel as composed, can’t figure out how to do it.
The docs say it’s possible:
A slash (“/”) is shown in front of the relationship number if the association is derived (i.e., compositional) with the relationship numbers that compose the association shown in curly braces, separated by commas, e.g., /R3 {R1,R2}.
However I can’t see how to do it. Pointers appreciated.
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