http://hl7.org/fhir/StructureDefinition/cqf-modelInfo-isRetrievable|5.2.0

Specifies whether the class constructed for the profile should be marked as retrievable in the model info (meaning whether or not it can appear as the target of a retrieve expression). If this value is not specified, retrievable is true for resources and false for data types.
NameFlagsCardTypeDescription & Constraints
Extension
0..1Whether the resources can be retrieved
 
url
?..?uri
 
value[x] *
1..?
 
 
valueBoolean *
1..?boolean