A particular challenge is posed by living corpora. Here, the manual transformations performed during onboarding should be reapplicable in case of edits to the source data. Accordingly, we implemented routines for a ›backward compatibility‹ of the markup: the changes made by us during onboarding can later be applied again to a newer version of the source files. <ref xmlns="http://www.tei-c.org/ns/1.0" n="6" target="ftn6" />