Multi-word annotation in syntactic treebanks - Propositions for Universal Dependencies.

This paper discusses how to analyze syntactically irregular expressions in a syntactic treebank. We distinguish such Multi-Word Expressions (MWEs) from comparable non-compositional expressions, i.e. idioms. A solution is proposed in the framework of Universal Dependencies (UD). We further discuss the case of functional MWEs, which are particularly problematic in UD.