<status value="draft" /> <description value="This profile describes the Attachment constraints for MERT needed to help support DocumentReference (MERT) resource." /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <type value="Attachment" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Attachment" /> <derivation value="constraint" /> <differential> <element id="Attachment"> <path value="Attachment" /> <constraint> <key value="AttachmentHasUrlOrData" /> <severity value="error" /> <human value="Attachment SHALL have either a url or data." /> <expression value="url.exists() or data.exists()" /> <source value="https://intrahealth.com/fhir/mert/StructureDefinition/AttachmentMERT" /> </constraint> </element> <element id="Attachment.contentType"> <path value="Attachment.contentType" /> <min value="1" /> <mustSupport value="true" /> </element> <element id="Attachment.data"> <path value="Attachment.data" /> <mustSupport value="true" /> </element> <element id="Attachment.url"> <path value="Attachment.url" /> <mustSupport value="true" /> </element> <element id="Attachment.title"> <path value="Attachment.title" /> <mustSupport value="true" /> </element> </differential> </StructureDefinition>