To be clear, HL7 is a not-for-profit organization which has created several sets of standards over its history (HL7-V1, V2, V3, etc)--those standards are what you are referring to above.
FHIR, which is what Apple is using, is its own standard, (created/managed through the HL7 organization) and is based on more modern representations of data (JSON, etc). (https://www.hl7.org/fhir/)
FHIR, which is what Apple is using, is its own standard, (created/managed through the HL7 organization) and is based on more modern representations of data (JSON, etc). (https://www.hl7.org/fhir/)