While the schema was initially formulated in RelaxNG, it is now maintained as a TEI ODD file <bibl xmlns="http://www.tei-c.org/ns/1.0" corresp="https://edition-humboldt.de/QGGN2BZP">(Viglianti 2019</bibl>) (from which, however, RNG derivatives continue to be created). It is derived using ODD chaining from the ediarum.BASE.schema, which in turn is derived from the DTABf. This makes it possible to maintain and track the respective changes to the next "higher" schema at each level (ediarum, edition humboldt digital etc.). The schema (as TEI-ODD file as well as RNG) are published on <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://github.com/telota/ediarum.AVHR.data-model">GitHub</ref>.