1.4 CDA Extension

 

Locally defined tags may be used when the local semantics isCDAThere is no corresponding statement in the specification. When a simple and standard mechanism is provided for the meaning of a label that is not shared,CDAWe strive to standardize the semantics of sharing at the highest level. To support local expansion, includingCDAOut of ArchitectureXMLNodes and attributes are allowed. These extensions should not change the meaning of standard data items, and the receiver must be able to safely ignore these nodes. When ignoring the extended content, the document recipient must be able to faithfully parseCDADocumentation.

 

Extensions may be included in non-Hl7v3An instance of a namespace, but it must not be included inEdType of nodes(For example In<Procedure>
Inside<Text>). BecauseEdThe data type content may be in a different namespace. Since all consistent content isHL7InEdType node), the sender can rotate any extended content to an external namespace (HL7Other Namespaces ). If such an extension exists, the receiving system cannot report any errors.

To expand the shared semantics,HL7Encourage users to reflect their needs in subsequent version standards.