Development of the DIGGS schema is on GitHub at https://github.com/DIGGSml
GitHub is an online platform for code development. It uses the open-source version control system Git. Many open-source projects use GitHub.
The DFI funded Rock Grouting Schema development project held two workshops in early September 2020. As a part of this effort, background training was provided to all attendees. These are good overview presentations of the inner workings of the DIGGS schema and can be viewed on this GitHub page. https://github.com/DIGGSml/diggs-schema/wiki/Rock-Grouting-Schema-Development
There you will find a listing of all the elements that can be used within the DIGGS schema. For example, the documentation for a borehole element is partially shown below.