Validate for nouny features on verby morphology

[emilymbender]

We should give validation warnings (at least) when the user tries to say that "person = 3rd" on a verb or auxiliary.

[ltxom]

I see there are code snippets in the lexicon.py that implemented this validation:

index_features = set(['person', 'number', 'gender'])

if lextype in ('verb', 'adj', 'cop'):
        ...
	elif feat.get('head') in ('verb', 'adj', 'cop'):
		if feat.get('name') in index_features:
			mess = 'This feature is associated with nouns. ' + \
				   'Please select one of the NP options to use this feature.'
			vr.err(feat.full_key + '_head', mess)

If PNG features are specified on verb, adj, or cop, it shows an error message. This logic can also apply to aux, but a comment says, "lap: 1/5/11 removed aux to get rid of overzealous validation." However, I think PNG features cannot apply to auxiliary, so we should block it as well?

Also, should we add 'case' into index_features other than PNG?

[emilymbender]

Yes, I suspect that whatever was "overzealous" back then isn't anymore. (Though maybe we'll find out!)

Where else is the variable index_features used? It's not correct to call CASE an index_features (it doesn't appear on ref-ind), so it might be better to invoke CASE separately (as in check the union of index_features and {CASE}).

[ltxom]

I got it! I will add aux back to the checklist.

The variable index_features is only used to check if the feature in this set is associated with nouns. But for clarity purposes, I will check CASE separately.

[emilymbender]

Sounds good!

[ltxom]

This issue can be closed :)