backrefs using ref name / annotations?

Hello,

(crossposting - hopefully not inappropriately)

I need automatic back references (just two-way references, really), but 
would like to find a way to have them using stock AT ref fields & 
widgets (I have taken a look at ATBackRef product).

I thought of a mechanism hooked somewhere that would (ab)use 
ReferenceField "relationship" property: upon reference creation, the 
mechanism would see if the target has a ReferenceField whose 
relationship attribute has the same value as the source relationship, 
and then automatically add another reference, ie. from the target to the 
source. Are there any places where this kind of hooks can be registered btw?

I don't know if using relationships this way confuses the reference 
system somehow - what are the consequences? I read something about 
reference annotations - could they be used for this purpose somehow?

I guess there's an easy way, too - just add a field property 
"[relationshipname]_inverese" in the field that is to be used as the 
back reference?

Overall, perhaps this kind of automatic backref mechanism using stock AT 
fields & widgets would be useful enough to be added to Archetypes?

Thoughts?

Thanks,

  Petri



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