The documentation of the data model is done in <ref xmlns="http://www.tei-c.org/ns/1.0" target="http://docs.oasis-open.org/dita/dita/v1.3/dita-v1.3-part3-all-inclusive.html">DITA</ref>, more precisely in the DITA files of <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://www.ediarum.org/docs/ediarum.BASE.manual/">ediarum.BASE.manual</ref>. This way synergies are used as well as specifications or modifications compared to the data model of ediarum.BASE.edit are documented. DITA (and not ODD) was chosen to enable this combination of ediarum.BASE.manual and the <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://edition-humboldt.de/richtlinien/index.html">guidelines of edition humboldt digital</ref>. Furthermore, the internal DITA documentation includes not only the coding guidelines based on the concrete material, but also the <hi xmlns="http://www.tei-c.org/ns/1.0" rendition="#i">operating instructions</hi> for the editors in ediarum.AVHR.edit.