This is part of archived UD v1 documentation. See http://universaldependencies.org/ for the current version.
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vocative: vocative

The vocative relation is used to mark a dialogue participant addressed in a text (common in conversations, dialogue, emails, newsgroup postings, etc.). The relation links the addressee’s name to its host sentence. A vocative commonly co-occurs with a null subject, as in the first example below. If the nominal is clearly vocative in intent, the preference is to use the vocative relation.

Guys , take it easy!
vocative(take, Guys)
Marie , comment vas - tu ?
vocative(vas, Marie)

vocative in other languages: [bg] [cs] [de] [el] [en] [es] [eu] [fa] [fi] [fr] [ga] [he] [hu] [it] [ja] [ko] [sv] [u]