An "ask at order" response using the datetime datetype for the result value

@prefix fhir: <http://hl7.org/fhir/> .
@prefix loinc: <https://loinc.org/rdf/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

# - resource -------------------------------------------------------------------

[a fhir:Observation ;
  fhir:nodeRole fhir:treeRoot ;
  fhir:id [ fhir:v "date-lastmp"] ; # 
  fhir:status [ fhir:v "final"] ; # 
  fhir:category ( [
     fhir:coding ( [
       fhir:system [ fhir:v "http://terminology.hl7.org/CodeSystem/observation-category"^^xsd:anyURI ] ;
       fhir:code [ fhir:v "survey" ] ;
       fhir:display [ fhir:v "Survey" ]
     ] ) ;
     fhir:text [ fhir:v "AOE" ]
  ] ) ; # 
  fhir:code [
     fhir:coding ( [
       a loinc:8665-2 ;
       fhir:system [ fhir:v "http://loinc.org"^^xsd:anyURI ] ;
       fhir:code [ fhir:v "8665-2" ] ;
       fhir:display [ fhir:v "Last menstrual period start date" ]
     ] ) ;
     fhir:text [ fhir:v "Last menstrual period start date" ]
  ] ; # 
  fhir:subject [
     fhir:reference [ fhir:v "Patient/pat2" ]
  ] ; # 
  fhir:effective [ fhir:v "2016-01-24"^^xsd:date] ; # 
  fhir:value [ fhir:v "2016-12-30"^^xsd:date]] . # 

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