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>