ISO 24611:2012 provides a framework for the representation of annotations of word-forms in texts; such annotations concern tokens, their relationship with lexical units, and their morpho-syntactic properties.It describes a metamodel for morpho-syntactic annotation that relates to a reference to the data categories contained in the ISOCat data category registry (DCR, as defined in ISO 12620). It also describes an XML serialization for morpho-syntactic annotations, with equivalences to the guidelines of the TEI (text encoding initiative).