The context is all elements that match the FHIRPath query found in the expression.
0‑L
element
Element ID
ExtensionContextType
2019-11-01T09:29:23
Preferred: Element ID
The context is any element that has an ElementDefinition.id that matches that found in the expression. This includes ElementDefinition Ids that have slicing identifiers. The full path for the element is [url]#[elementid]. If there is no #, the Element id is one defined in the base specification.
0‑L
extension
Extension URL
ExtensionContextType
2019-11-01T09:29:23
Preferred: Extension URL
The context is a particular extension from a particular StructureDefinition, and the expression is just a uri that identifies the extension.
Legenda: Type L=leaf, S=specializable, A=abstract, D=deprecated. NullFlavor OTH (other) suggests text in originalText. HL7 V3: NullFlavors to appear in @nullFlavor attribute instead of @code.