WHO SMART Trust
1.7.1 - release

WHO SMART Trust, published by WHO. This guide is not an authorized publication; it is the continuous build for version 1.7.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/WorldHealthOrganization/smart-trust/tree/v1.7.1-releasecandidate and changes regularly. See the Directory of published versions

## : WHO GDHCN Key Usage CodeSystem - UAT - TTL Representation

Active as of 2026-08-27

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    @prefix fhir: <http://hl7.org/fhir/> .
    @prefix owl: <http://www.w3.org/2002/07/owl#> .
    @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
    @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
    @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

    # - resource -------------------------------------------------------------------

    <http://hl7.org/fhir/CodeSystem/KeyUsage-UAT> a fhir:CodeSystem ;
      fhir:nodeRole fhir:treeRoot ;
      fhir:id [ fhir:v "KeyUsage-UAT"] ; #
      fhir:text [
         fhir:status [ fhir:v "generated" ] ;
         fhir:div [ fhir:v "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p class=\"res-header-id\"><b>Generated Narrative: CodeSystem KeyUsage-UAT</b></p><a name=\"KeyUsage-UAT\"> </a><a name=\"hcKeyUsage-UAT\"> </a><p>This case-insensitive code system <code>http://smart.who.int/trust/CodeSystem/KeyUsage-UAT</code> defines the following codes:</p><table class=\"codes\"><tr><td style=\"white-space:nowrap\"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style=\"white-space:nowrap\">SCA<a name=\"KeyUsage-UAT-SCA\"> </a></td><td>Signer Certificate Authority (SCA)</td><td>A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant</td></tr><tr><td style=\"white-space:nowrap\">DSC<a name=\"KeyUsage-UAT-DSC\"> </a></td><td>Document Signing Certificate (DSC)</td><td>A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate</td></tr><tr><td style=\"white-space:nowrap\">DECA<a name=\"KeyUsage-UAT-DECA\"> </a></td><td>Data Exchange Certificate Authority (DECA)</td><td>A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant</td></tr><tr><td style=\"white-space:nowrap\">DESC<a name=\"KeyUsage-UAT-DESC\"> </a></td><td>Data Exchange Signing Certificate (DESC)</td><td>A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants</td></tr><tr><td style=\"white-space:nowrap\">TLS<a name=\"KeyUsage-UAT-TLS\"> </a></td><td>Transport Layer Security (TLS)</td><td>Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant</td></tr><tr><td style=\"white-space:nowrap\">UP<a name=\"KeyUsage-UAT-UP\"> </a></td><td>Upload (UP)</td><td>Used to verify digital signature of cryptographically signed content uploaded to services within the Global Digital Health Certification Network, in particular the Trust Network Gateway</td></tr></table></div>"^^rdf:XMLLiteral ]
      ] ; #
      fhir:url [ fhir:v "http://smart.who.int/trust/CodeSystem/KeyUsage-UAT"^^xsd:anyURI] ; #
      fhir:version [ fhir:v "1.7.1"] ; #
      fhir:name [ fhir:v "KeyUsage-UAT"] ; #
      fhir:title [ fhir:v "WHO GDHCN Key Usage CodeSystem - UAT"] ; #
      fhir:status [ fhir:v "active"] ; #
      fhir:experimental [ fhir:v true] ; #
      fhir:date [ fhir:v "2026-08-27T05:23:17+00:00"^^xsd:dateTime] ; #
      fhir:publisher [ fhir:v "WHO"] ; #
      fhir:contact ( [
         fhir:name [ fhir:v "WHO" ] ;
         fhir:telecom ( [
           fhir:system [ fhir:v "url" ] ;
           fhir:value [ fhir:v "http://who.int" ]
         ] )
      ] ) ; #
      fhir:description [ fhir:v "CodeSystem for GDHCN Key Usage that has usage codes for verification keys published to the Trust Network as defined by the [certificate governance](concepts_certificate_governance.html) for User Acceptance Testing environment"] ; #
      fhir:jurisdiction ( [
         fhir:coding ( [
           fhir:system [ fhir:v "http://unstats.un.org/unsd/methods/m49/m49.htm"^^xsd:anyURI ] ;
           fhir:code [ fhir:v "001" ]
         ] )
      ] ) ; #
      fhir:caseSensitive [ fhir:v false] ; #
      fhir:content [ fhir:v "complete"] ; #
      fhir:count [ fhir:v "6"^^xsd:nonNegativeInteger] ; #
      fhir:concept ( [
         fhir:code [ fhir:v "SCA" ] ;
         fhir:display [ fhir:v "Signer Certificate Authority (SCA)" ] ;
         fhir:definition [ fhir:v "A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant" ]
      ] [
         fhir:code [ fhir:v "DSC" ] ;
         fhir:display [ fhir:v "Document Signing Certificate (DSC)" ] ;
         fhir:definition [ fhir:v "A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate" ]
      ] [
         fhir:code [ fhir:v "DECA" ] ;
         fhir:display [ fhir:v "Data Exchange Certificate Authority (DECA)" ] ;
         fhir:definition [ fhir:v "A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant" ]
      ] [
         fhir:code [ fhir:v "DESC" ] ;
         fhir:display [ fhir:v "Data Exchange Signing Certificate (DESC)" ] ;
         fhir:definition [ fhir:v "A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants" ]
      ] [
         fhir:code [ fhir:v "TLS" ] ;
         fhir:display [ fhir:v "Transport Layer Security (TLS)" ] ;
         fhir:definition [ fhir:v "Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant" ]
      ] [
         fhir:code [ fhir:v "UP" ] ;
         fhir:display [ fhir:v "Upload (UP)" ] ;
         fhir:definition [ fhir:v "Used to verify digital signature of cryptographically signed content uploaded to services within the Global Digital Health Certification Network, in particular the Trust Network Gateway" ]
      ] ) . #