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In the value set https://terminology.hl7.org/2.1.0/ValueSet-v3-RoleClassAgent.html RoleClassAgent GUARD is the item.
From CDA 2.0.1 https://build.fhir.org/ig/HL7/cda-core-2.0//StructureDefinition-Guardian-definitions.html Guardian.
So, we can extend the patient contact relationship value set to include Guardian or we can use the value set above for contact relationship.
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