{description: '**The patient''s date of birth**  \n**NOTE**: This US Core SearchParameter definition extends the usage context of the\n[Conformance expectation extension](http://hl7.org/fhir/R4/extension-capabilitystatement-expectation.html)\n - multipleAnd\n - multipleOr\n - comparator\n - modifier\n - chain', package_name: hl7.fhir.us.core, name: USCorePatientBirthdate, type: date, package_version: 4.0.0, class: unknown, kind: null, url: 'http://hl7.org/fhir/us/core/SearchParameter/us-core-patient-birthdate', version: 4.0.0}