description: The number of frames in an ImagingStudy instance as required by Xt-EHR logical ImagingStudy logical model. package_name: hl7.fhir.cz.img derivation: constraint name: NumberOfFrames type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'https://hl7.cz/fhir/img/StructureDefinition/NumberOfFrames'} index: 1 value: choices: [valueInteger] index: 3 valueInteger: {type: integer, choiceOf: value, index: 4} package_version: 1.0.0 extensions: {} class: extension kind: complex-type url: https://hl7.cz/fhir/img/StructureDefinition/NumberOfFrames base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0