For this first attempt of developing an Old Tibetan Treebank, we therefore decided to reduce the amount of tags to a small and simplified version of the standard Universal Dependency POS set, consisting of 15 tags only (De Marneffe et al., 2014).
we substituted 'I' with 'i', which is the standard wylie transliteration for this character, as shown in (1): (1) rgyal po'I > rgyal po'i 'of the king' The Old Tibetan script furthermore presents a set of features that need to be 'normalised' or converted to a form that looks like Classical Tibetan.