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We call a node of a dependency structure a lexical node. Each lexical node of a dependency structure contains information on category, agreement and valency (i. e. what types of complements are required by the word).
Each word of a sentence must satisfy one its frames in the lexicon.
Subjects must be nominative and agree with its head (the verb).
Accusative objects must be accusative.
The root of a sentence must be a finite verb.
A lexical node must have precisely the complements required by its valency. Each required complement is satisfied by a unique edge labeled with the complement (role) type.
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