NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension I0..*ElementBase for all elements
ele-1: All FHIR elements must have a @value or children
... id I0..1idxml:id (or equivalent in JSON)
ele-1: All FHIR elements must have a @value or children
... extension I0..*ExtensionAdditional Content defined by implementations
ele-1: All FHIR elements must have a @value or children
... url I1..1uri"http://example.org/fhir/StructureDefinition/PatientNetWorthExtension"
... valueDecimal I0..1decimalValue of extension
ele-1: All FHIR elements must have a @value or children

doco Documentation for this format