{
  "resourceType" : "Observation",
  "id" : "eye-color",
  "status" : "final",
  "code" : {
    "text" : "eye color"
  },
  "subject" : {
    "reference" : "Patient/example"
  },
  "effectiveDateTime" : "2016-05-18",
  "valueString" : "blue"
}