Basque interrogatives

[mlforcada]

I believe Feature 93A "Position of Interrogative Phrases in Content Questions" has the wrong value ("Interrogative phrases not obligatorily initial") for Basque. Basque interrogative phrases, both of the "no-" (nor, nori, nork, non, nondik, nora, etc.) or of the "ze-" form (zer, zein, etc.) or phrases containing them systematically appear at the beginning of the sentence:

Patxik Liburua erosi du
Patxi-ERG Book-DET-ABS bought has-it
'Patxi has bought a book"

Zer erosi du Patxik?
What-ABS bought has-it Patxi-ERG
'What has Patxi bought?'

This seems to be the general behaviour, although there is a description of dialects that do not behave so: https://muse.jhu.edu/article/539650/pdf