Here's an example of a properly formatted HL7 CDA document structure:

<?xml version="1.0" encoding="UTF-8"?>
<ClinicalDocument xmlns="urn:hl7-org:v3">
  <recordTarget>
    <patientRole>
      <id extension="12345" root="2.16.840.1.113883.19.5"/>
      <patient>
        <name>
          <given>John</given>
          <family>Doe</family>
        </name>
        <administrativeGenderCode code="M"/>
        <birthTime value="19850315"/>
      </patient>
    </patientRole>
  </recordTarget>
  <component>
    <structuredBody>
      <component>
        <section>
          <code code="11450-4" displayName="Problem List"/>
          <entry>
            <observation>
              <value code="I25.9" displayName="Coronary artery disease"/>
            </observation>
          </entry>
        </section>
      </component>
    </structuredBody>
  </component>
</ClinicalDocument>