Usage of the ontology with W3C Verifiable Credentials

[tplooker]

Hi, firstly thanks for this project it is great work! I work in the Credentials Community Group working with technologies like W3C Verifiable Credentials and as of recent there has been much interest in applications of the technology for vaccination certificates. As a result I have begun the initiative to define a vocabulary for this purpose however ideally we would like to leverage more existing ontologies like HL7 FHIR so are open to redefining terms in the vocab to suit this and I believe we could leverage some of the great work you guys have done to date to accomplish this?

A couple of quick questions w.r.t your work

1. How actively is the ontology maintained and how complete is it? It would be great to know this in reference to both R4 and R5
2. It appears the current IRIs the context uses are not resolvable i.e I get a 404 on http://hl7.org/fhir/Patient.gender