f:CodeSystem url: minimum cardinality of 'url' is 1 version: minimum cardinality of 'version' is 1 name: minimum cardinality of 'name' is 1 experimental: minimum cardinality of 'experimental' is 1 publisher: minimum cardinality of 'publisher' is 1 description: minimum cardinality of 'description' is 1 concept: minimum cardinality of 'concept' is 1 CodeSystem If the resource is contained in another resource, it SHALL NOT contain nested Resources (inherited) If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (inherited) If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource (inherited) A resource should have narrative for robust management (inherited) If a resource is contained in another resource, it SHALL NOT have a security label (inherited) Within a code system definition, all the codes SHALL be unique (inherited) Name should be usable as an identifier for the module by machine processing applications such as code generation (inherited) CodeSystem.filter All FHIR elements must have a @value or children (inherited) CodeSystem.property All FHIR elements must have a @value or children (inherited) CodeSystem.concept All FHIR elements must have a @value or children (inherited) CodeSystem.concept.designation All FHIR elements must have a @value or children (inherited) CodeSystem.concept.property All FHIR elements must have a @value or children (inherited)