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This page still pertains to UD version 1.

root: root

The root grammatical relation points to the root of the sentence. A fake node ROOT is used as the governor. The ROOT node is indexed with 0, since the indexing of real words in the sentence starts at 1. This relation is universal.

Eu quero viver !
root(ROOT, quero)

There should be just one node with the root dependency relation in every tree. If the main predicate is not present (due to ellipsis) and there are multiple orphaned dependents, the leftmost dependent should be promoted to the head (root) position and the other orphans should be attached to it.

ROOT PT no governo .
root(ROOT, PT)
case(governo, em)
nmod(PT, governo)

root in other languages: [bm] [cop] [cs] [el] [en] [es] [fi] [fr] [ga] [hy] [it] [ja] [kk] [myv] [no-overview] [pcm] [pt] [ro] [ru] [sv] [swl] [tr] [u] [yue] [zh]