http://hl7.org/fhir/StructureDefinition/quantity-precision|4.0.1

Explicit precision of the number. This is the number of significant decimal places after the decimal point, irrespective of how many are actually present in the explicitly represented decimal.
NameFlagsCardTypeDescription & Constraints
Extension
0..1Explicit precision (number of significant decimal places)
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueInteger *
1..?integer