[Ontology-editors] constituent part

[Chris Mungall]

We use the phrase "constituent part" in (almost) all the "X part"  
terms; e.g.:

axoneme part [DEF: "Any constituent part of an axoneme, the bundle of  
microtubules and associated proteins that forms the core of cilia and  
flagella in eukaryotic cells and is responsible for their movements."]

What exactly does "constituent" mean here?

I recall being part of the discussion that lead to this, but can't  
find the relevant emails. Did we just import this term from the FMA?  
It seems to have a specific meaning in anatomy. I can't really find a  
solid definition in the FMA papers.

I don't see anything in the component docs either.

I think we should either document this or drop it

Here's why I'm interested - I define X part generically as a cellular  
component that is part_of X.

This means the reasoner throws up:

     "rhoptry lumen" [GO:0034591] is_a "extracellular region  
part" [GO:0044421]
     "rhoptry lumen" [GO:0034591] is_a "cell part" [GO:0044464]

Is there something subtle in the "constituent" qualifier that is  
missing from my xp definition, that simultaneously excludes the above  
links?