The term CDATA is used about text data that should not be parsed by the XML parser. Some registries mostly Immunization registries need the HL7 message that is in the soap envelope to be wrapped with this tag.
Add "<![CDATA[" before the hl7 message
Add "]]>" to after the hl7 message
Example of wrapping the HL7 with a CDATA tag in a qvera soap envelope.
<urn:hl7Message>
<![CDATA[{m:/}]]>
</urn:hl7Message>