This is the ValueSet that contains all the codes in FR Core ValueSet Contact relationship (https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-contact-relationship) and FR Core ValueSet Contact relationship (https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-contact-relationship). E.g. what you have to deal with if you get resources containing codes in either of them