http://hl7.org/fhir/StructureDefinition/parameters-definition|5.2.0

This specifies the definition for a parameter if needed. This is useful for communicating the type of a parameter when the parameter has no value.
NameFlagsCardTypeDescription & Constraints
Extension
0..1Definition for parameter
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueParameterDefinition *
1..?ParameterDefinition