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

The expl relation is used in UD Greek for cases of clitic doubling.

Της τον έδωσε της Καίτης τον αναπτήρα
expl(έδωσε, Της-1)
iobj(έδωσε, Καίτης)
expl(έδωσε, τον-2)
dobj(έδωσε, αναπτήρα)

But when clitics appear alone in the sentence, they are labeled as core arguments.

Της τον έδωσε
iobj(έδωσε, Της)
dobj(έδωσε, τον)

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