http://hl7.org/fhir/StructureDefinition/procedure-schedule|5.2.0

The schedule that was followed. Use Procedure.occurrenceTiming in R5+
NameFlagsCardTypeDescription & Constraints
Extension
0..1Schedule followed
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueTiming *
1..?Timing