description: This is an equivalent of the string on which the extension is sent, but includes additional XHTML markup, such as bold, italics, styles, tables, etc. Existing [restrictions on XHTML content](narrative.html#security) apply. Note that using [markdown](extension-rendering-markdown.html) allows for greater flexibility of display.
package_name: hl7.fhir.r4b.core
derivation: constraint
name: xhtml
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/rendering-xhtml'}
    index: 1
  value:
    choices: [valueString]
    index: 3
  valueString: {type: string, choiceOf: value, index: 4}
package_version: 4.3.0
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/rendering-xhtml
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 4.3.0
required: [valueString, value]