Notes for Official Publishing Transition of PH Core

https://confluence.hl7.org/spaces/FHIR/pages/35718627/IG+Publisher+Documentation#IGPublisherDocumentation-RulesforImplementationGuides

https://confluence.hl7.org/spaces/FHIR/pages/35718826/Guide+to+Designing+Resources

https://build.fhir.org/ig/FHIR/fhir-tools-ig/branches/master/CodeSystem-ig-parameters.html