(further discussion needed on distinction as to a) whether the code system is present on the server and b) whether it is possible to be used a the substrate for an expansion operation)
Watch that running this statement on any unix or mac command line will result in the dollar sign being interpreted as a variable (which probably doesn't exist!) and the URL will break at that point. Change the " to ' to avoid this.
```
curl --location --request GET "https://ontoserver.csiro.au/stu3-latest/ValueSet/$expand?url=http%253A%252F%252Fsnomed.info%252Fsct%252F32506021000036107%252Fversion%252F20160630%253Ffhir_vs%253Drefset%252F929360061000036106&_format=xml"
```
How can I find out which value sets contain a given concept?
See Section 4.9.8.6 of the FHIR Specification - "Searching for codes in Value Sets" - at http://hl7.org/fhir/valueset.html. In the case of SNOMED CT, this would exclude any implicit FHIR Value Set that contains an edition and version of the Code System in its entirety.
How can I find out which reference sets contain a given concept?
Could reference set membership be a property of the code?
In ConceptMap translate what is the difference between system and source/target?
Source and Target are Valuesets and System is the CodeSystem of the code being looked up.
Top Tip
Watch out for a URL for the Expand operation that contains an additional question mark (e.g. implicit Value Set syntax)