description: 'R4: `SubstanceNucleicAcid.numberOfSubunits` (new:integer)' package_name: hl7.fhir.uv.xver-r4.r3 derivation: constraint name: ExtensionSubstanceNucleicAcid_NumberOfSubunits type: Extension elements: url: base: {max: '1', min: 1, path: Extension.url} pattern: {type: Uri, value: 'http://hl7.org/fhir/4.0/StructureDefinition/extension-SubstanceNucleicAcid.numberOfSubunits'} index: 0 value: base: {max: '1', min: 0, path: 'Extension.value[x]'} short: 'The number of linear sequences of nucleotides linked through phosphodiester bonds shall be described. Subunits would be strands of nucleic acids that are tightly associated typically through Watson-Crick base pairing. NOTE: If not specified in the reference source, the assumption is that there is 1 subunit' choices: [valueInteger] index: 2 valueInteger: short: 'The number of linear sequences of nucleotides linked through phosphodiester bonds shall be described. Subunits would be strands of nucleic acids that are tightly associated typically through Watson-Crick base pairing. NOTE: If not specified in the reference source, the assumption is that there is 1 subunit' type: integer base: {max: '1', min: 0, path: 'Extension.value[x]'} choiceOf: value index: 3 package_version: 0.1.0 class: extension kind: complex-type url: http://hl7.org/fhir/4.0/StructureDefinition/extension-SubstanceNucleicAcid.numberOfSubunits base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.1.0 required: [url]