description: Where it is necessary to reference an external clinical document, the External Document Reference template can be used to reference this external document. However, if the containing document is appending to or replacing another document in the same set, that relationship is set in the header, using ClinicalDocument/relatedDocument.
package_name: hl7.cda.us.ccda
derivation: constraint
name: ExternalDocumentReference
type: http://hl7.org/cda/stds/core/StructureDefinition/ExternalDocument
elements:
  templateId:
    index: 0
    slicing:
      rules: open
      discriminator:
      - {path: root, type: value}
      - {path: extension, type: value}
      min: 1
      slices:
        external-doc-ref:
          match: {root: 2.16.840.1.113883.10.20.22.4.115, extension: '2014-06-09'}
          schema:
            _required: true
            index: 1
            elements:
              root:
                pattern: {type: string, value: 2.16.840.1.113883.10.20.22.4.115}
                type: string
                index: 2
              extension:
                pattern: {type: string, value: '2014-06-09'}
                type: string
                index: 3
            required: [extension, root]
            extensions: {}
  classCode:
    pattern: {type: code, value: DOCCLIN}
    type: code
    index: 4
  moodCode: {index: 5}
  id: {index: 6}
  code: {index: 7}
  setId: {index: 8}
  versionNumber: {index: 9}
package_version: 4.0.0
class: logical
kind: logical
url: http://hl7.org/cda/us/ccda/StructureDefinition/ExternalDocumentReference
base: http://hl7.org/cda/stds/core/StructureDefinition/ExternalDocument
version: 4.0.0
required: [classCode, code, id, moodCode, templateId]