The clear definition of the
semantics of the PoS, with clear tests for the inclusion of an
item in a given PoS, and the semantics of
attributes and values, with criteria for the encoding is considered
another important
requirement of the development of guidelines for lexicon
encoding.
Each main category section starts with a description of the semantics
of the class (pos-values section).
As already explained in Teufel 1995,
{pos is a special type of feature; as pos
encodes our main categories, its values have to appear in different
sections, in contrast to all other features.