Some little topic Here are some ITS definitions: Data category ITS defines data category as an abstract concept for a particular type of information for internationalization and localization of XML schemas and documents. Scope Scope is a means to describe to what elements and/or attributes an ITS data category and its values should be applied to. As for the implementation of ITS: just apply the rules in the order: Default Rules in the schema Dislocated rules in situ rules Et voila ! The last rule wins