UD Annotatrix: An annotation tool for Universal Dependencies Francis M Tyers author Mariya Sheyanova author Jonathan North Washington author 2017 text Proceedings of the 16th International Workshop on Treebanks and Linguistic Theories Jan Hajič editor Prague, Czech Republic conference publication tyers-etal-2017-ud https://aclanthology.org/W17-7604/ 2017 10 17