This release of the Digital Mitford project documentation includes new validation for the TEI @dur attribute for representing durations of events. It also improves our validation of @subtype attributes based on their associated @type attributes on the TEI <occupation> element in our Site Index and “back lists” across the project. Finally, it incorporates the https://github.com/DigitalMitford/DM_SiteIndex/releases/tag/v3.7.0 release of the Site Index, for a total of 2789 distinct named entities.