FHIR resources often contain canonical identifiers. This datatype uses an URI to refer to the used system. Note when these take the form of a URL they are not by definition resolvable. Specific URIs to use in Belgian profiles are explained in the profiles and a general overview can be found here: oid-overview.
To refer to a number of the national registry: <identifier>
<use value="official"/> <system value="https://www.ehealth.fgov.be/standards/fhir/NamingSystem/ssin"/>
<value value="7031966696"/> </identifier>
Special Remarks for KMEHR users:
Note there is no S=’LOCAL’ way in FHIR. A local system will be identified by its own unique URI.
Textual and parts/structured information
A narrative SHOULD be included in resource instances. When doing so, the guidelines of the HL7 FHIR specification SHALL be followed strictly.