V2.1.1

NB: Contains a few known errors involving tagging of brackets (see #4). This version is the basis for:

Zeldes, Amir and Simonson, Dan (2016) "Different Flavors of GUM: Evaluating Genre and Sentence Type Effects on Multilayer Corpus Annotation Quality". In: Proceedings of LAW X – The 10th Linguistic Annotation Workshop. Berlin, 68–78.