|IHE MHD Profile on DocumentReference (DocumentEntry) from a Query with Comprehensive Metadata (aka XDS-on-FHIR), see Table 3:188.8.131.52-3.|
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IHE IT-Infrastructure Domain
Profiles on FHIR
In the context of IHE Profiles documented using the FHIR conformance resources, when the FHIR StructureDefintion "Must Support" is indicated on any data element it SHALL be interpreted as Required if known. If the sending application has data for the element, it is required to populate the element with a non-empty value. If the value is not known, the element may be omitted. A receiving application may ignore the information conveyed by the element. A receiving application shall not raise an error solely due to the presence or absence of the element.
NOTE: The above definition of Must Support is derived from IHE "Required if Known - R2 and "HL7v2 concept “Required but may be empty - RE” described in HL7v2 V28_CH02B_Conformance.doc.