R. de Rijk (1972): "In particular, there is no difference in intonation between restrictive and appositive relative clauses in Basque."

Atzoko sarreran genioen ze "-n" erlatiboak izan daitezké murriztaileak edo ez-murriztaileak aráuz kontextua. Puntu horretaz, ikus ondorengo aipua ganik R. de Rijk burúz "-n" erlatiboak ("Studies in Basque syntax: relative clauses", 1972):

What about the distinction between restrictive and appositive relative clauses, so important in the grammar of English and other Indo-European languages? I can be quite brief here: I am unaware of any syntactic differences in Basque between these two types of relative clauses, except for the obvious universal cooccurrence restrictions between either type of relative and certain types of head noun phrases. In Basque, like everywhere else, a relative clause that modifies a noun phrase with an underlying (i.e. deictic) demonstrative element must be non restrictive. When certain quantifiers, like guzti "all" and bakoitz "each" occur associated with the head noun phrase, the relative clause can only be restrictive. Apart from this, however, my investigations have failed to show any differences in syntactic behavior between the two. In particular, there is no difference in intonation between restrictive and appositive relative clauses in Basque.
...
No structural differences could be found between restrictive and non-restrictive (appositive) relative clauses. [R. de Rijk, 1972:139]

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