(Q16132)

A set of elements and values designed to annotate data. It usually consists in a formal representation. It aims to represent a specific level of information, such as morphological features of words, syntactic dependency relations between phrases, discourse level information, etc. It can consist of a flat structure of elements and values (e.g., part-of-speech tags) or it can be more complex with interrelated elements (e.g., specific morphological features to be used for each part-of-speech).