Universal Dependencies are an attempt at standardization of syntactic annotations that provide detailed guidelines for all levels of linguistic analysis 1 .
:  data encoding: UTF-8;  data format: an extension of the tab separated CoNLL-X format;  sentence splitting: only one root per sentence;  tokenization: one syntactic word per token; multiword expressions span several tokens; no empty tokens or traces are allowed;  PoS tags and morphological features are to be taken from a fixed inventory (Zeman, 2008); a column with language specific tags is also allowed.