The Trans Tab of the eXtyles style palette includes paragraph styles that will be used to style translated content; for example, titles and abstracts. These styles should only be used for content that is in a secondary language (i.e., not primary) in the document, and that secondary language must be defined in the Document Information dialog.
Note that the Trans Tab is the same for all Brepols documents.
If the translated title/subtitle styles are used, the @xml:lang value comes from the Secondary Language dropdown on the DocInfo; if this is not completed, the export will give a parsing error.