<?xml version=“1.0” encoding=“UTF-8”?> <Observation xmlns=“hl7.org/fhir”>

      <id value="eye-color"/>
      <meta>
  <security>
    <system value="http://terminology.hl7.org/CodeSystem/v3-ActReason"/>
    <code value="HTEST"/>
    <display value="test health data"/>
  </security>
</meta>
<status value="final"/>
      <code>
              <text value="eye color"/>
      </code>
      <subject>
              <reference value="Patient/example"/>
      </subject>
      <effectiveDateTime value="2016-05-18"/>
      <valueString value="blue"/>

</Observation>