How to encode this question in the datamodel

[yhamoudi]

Question found by @robocop:

Which presidents have been killed by their children?

What is the normal form (we don't want to obtain the presidents killed by the children of other presidents) ?

[progval]

You were talking about named missing leafs at some point in last semester, right? That would give something like (?a, killed by, (?b, parent, ?a)) \cap (?, office held, president)

[yhamoudi]

a really big change into the datamodel 😱

[Tpt]

I don't see how to do it in an other way. I believe it should be solved in PPP 2 (but not before...)