"http://hl7.org/fhir/R4/conformance-rules.html#ismodifier">Is Modifier</a></td><td>false</td></tr><tr><td style="white-space: nowrap">XML Format</td><td>In the XML format, this property is represented as an attribute.</td></tr><tr><td style="white-space: nowrap"><a href="http://hl7.org/fhir/R4/search.html#summary">Résumé</a></td><td>false</td></tr>

<tr><td colspan="2" class="structure"><span class="self-link-parent"><a name="Extension.extension">  </a><span style="color: grey">4</span><b>. Extension.ex