end property
End is the position just past the span, excluded — the range is half-open, so an empty range has Start equal to End.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
Position? end;