I am researching about electronic health records (EHR). OpenEHR seems to be quite extended and appreciated in this field, as it is widely adopted. However, I fail to find how it
You may find some help by looking at this work on GitHub https://github.com/ppazos?tab=repositories much of it is based around openEHR concepts.
In the world of multi-level knowledge modeling in healthcare there is also MLHIM. MLHIM grew out of experience with openEHR and is based directly on XML standards. www.mlhim.org and https://github.com/mlhim