'This function converts the annotation from the Multex-East to the universal tagset
as described in Chapter 5 of the NLTK-Book
Unknown Tags will be mapped to X. Punctuation marks are not supported in MSD tags, so'

@staticmethod
def msd_to_universal(tag):

    indicator = (tag[0] if (not (tag[0] == '#')) else tag[1])
    if (not (indicator in MTETagConverter.mapping_msd_universal)):
        indicator = '-'
    return MTETagConverter.mapping_msd_universal[indicator]
