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

      <id value="bmi-using-related"/><!--   ======== need to fix vitals to removed fixed value 'has-member' ==========
      <meta>
              <profile value="http://hl7.org/fhir/StructureDefinition/vitalsigns"/>
      </meta>
    --><meta>
  <security>
    <system value="http://terminology.hl7.org/CodeSystem/v3-ActReason"/>
    <code value="HTEST"/>
    <display value="test health data"/>
  </security>
</meta>
<status value="final"/>
      <category>
              <coding>
                      <system value="http://terminology.hl7.org/CodeSystem/observation-category"/>
                      <code value="vital-signs"/>
                      <display value="Vital Signs"/>
              </coding>
              <text value="Vital Signs"/>
      </category>
      <code>
              <coding>
                      <system value="http://loinc.org"/>
                      <code value="39156-5"/>
                      <display value="Body mass index (BMI) [Ratio]"/>
              </coding>
              <text value="BMI"/>
      </code>
      <subject>
              <reference value="Patient/example"/>
      </subject>
      <effectiveDateTime value="1999-07-02"/>
      <valueQuantity>
              <value value="16.2"/>
              <unit value="kg/m2"/>
              <system value="http://unitsofmeasure.org"/>
              <code value="kg/m2"/>
      </valueQuantity>
      <derivedFrom>
              <reference value="Observation/bodyheight"/>
              <display value="Body Height"/>
      </derivedFrom>
      <derivedFrom>
              <reference value="Observation/example"/>
              <display value="Body Weight"/>
      </derivedFrom>

</Observation>