http://hl7.org/fhir/StructureDefinition/elementdefinition-selector|5.2.0

A FHIRPath statement that defines whether an element is in the slice. DEPRECATED: This was never used. The relevant FHIRPath is automatically calculated by the tooling.
element_idtypes
Extension
Extension.extension
Extension.url
Extension.value[x]
Extension
Extension.id
Extension.extension
Extension.url
Extension.value[x]