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
If you are interested in the combination REST+openEHR (or other archetype-based EHR approaches like CIMI or ISO 13606) then you might find the approach described in http://www.biomedcentral.com/1472-6947/13/57 interesting, corresponding open source code in Java is available at https://github.com/LiU-IMT/EEE
More recent discussions regarding specifying/standardizing an openEHR REST API can be found at https://openehr.atlassian.net/wiki/display/spec/openEHR+REST+APIs
Having a standardized REST API for openEHR will enable end user applications to connect to openEHR backends from several different vendors/projects so that you do not need to spend so much time on storage & query.