5.4 Extension and Namespace
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## 5.4 Extension and Namespace

In accordance with CDA R2 (and HL7 v3 XML) extensibility rules, as described in CDA R2 Section 1.4, "locally-defined" XML markup may be specified where there is a need to communicate information for which there is no suitable representation in CDA R2. These extensions are described in the context of the templates where they are used. All such extensions use HL7 v3 Data Types used by CDA R2.

### Note

The HL7 Structured Documents Working Group coordinates markup extensions that have been defined for implementation guides published by HL7, IHE, DICOM, and other organizations. See http://wiki.hl7.org/index.php?title=CDA_R2_Extensions

The namespace for extensions defined in this standard is "urn:dicom-org:ps3-20", which is aliased in this standard as "ps3-20". Extensions defined in this standard are:

- ps3-20:accessionNumber - The accessionNumber extension allows for the clear identification of the imaging department identifier for a service request (order). While this identifier could be conveyed as another id for the inFulfillmentOf/Order element, there is no reliable way in that context to distinguish it from the Placer Order Number. As this is a primary management identifier in departmental workflows, a distinct local markup is defined. This extension uses the II Data Type.

The namespace for extensions defined by HL7 is "urn:hl7-org:sdtc". which is aliased in this standard as "sdtc". HL7 defined extensions used in this standard are:

- sdtc:signatureText - Provides a location for a textual or multimedia depiction of the signature by which the participant endorses and accepts responsibility for his or her participation in the Act as specified in the Participation.typeCode. Details of the element content are described in the HL7 CDA Digital Signature Standard. This extension uses the ED Data Type.

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