Can canonical references outside of a resource’s
url field, for example Questionnaire.derivedFrom, be relative? Do they also need to be FHIR RESTful compliant?
In our use case we want to link to a FHIR resource relative to our server, but not sure if it needs to be in the //id form or if it can be in an arbitrary path
Edit: my understanding from the docs is that it could be relative, and references only MAY be FHIR API compliant. Just not 100% confident on my understanding of the docs