Name Flags Card. Type Description & Constraints doco
. . Expression TU Element An expression that can be used to generate a value
+ Rule: An expression or a reference must be provided
+ Rule: The name must be a valid variable name in most computer languages

Elements defined in Ancestors: id, extension
. . . description 0..1 string Natural language description of the condition
. . . name C 0..1 code Short name assigned to expression for reuse
. . . language 0..1 code text/cql | text/fhirpath | application/x-fhir-query | etc.
Binding: Expression Language ( Extensible)
Additional Bindings Purpose
Mime Types Max Binding

. . . expression C 0..1 string Expression in specified language
. . . reference C 0..1 uri Where the expression is found

doco Documentation for this format