<StructureDefinition xmlns="http://hl7.org/fhir">
  <meta>
    <lastUpdated value="2017-05-06T16:47:29.107+02:00" />
  </meta>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="oo" />
  </extension>
  <url value="http://example.org/StructureDefinition/ECGObservation" />
  <name value="ECGObservation" />
  <status value="draft" />
  <date value="2017-05-06T16:02:04.9593346+02:00" />
  <description value="StructureDefinition for ECG Observation Resource" />
  <fhirVersion value="3.0.0" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation" />
  <derivation value="constraint" />
  <differential>
    <element>
      <path value="Observation" />
      <constraint>
        <key value="obs-7" />
        <severity value="error" />
        <human value="Device reference target should have same code as this instance" />
        <expression value="true" />
      </constraint>
    </element>
    <element>
      <path value="Observation.code.coding" />
      <max value="1" />
    </element>
    <element id="Observation.code.coding.system">
      <path value="Observation.code.coding.system" />
      <fixedUri value="urn:iso:std:iso:11073:10101" />
    </element>
    <element id="Observation.code.coding.code">
      <path value="Observation.code.coding.code" />
      <fixedCode value="147842" />
    </element>
    <element id="Observation.code.coding.display">
      <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
        <valueBoolean value="true" />
      </extension>
      <path value="Observation.code.coding.display" />
      <fixedString value="MDC_ECG_CARD_BEAT_RATE" />
    </element>
    <element>
      <path value="Observation.valueQuantity" />
      <type>
        <code value="Quantity" />
      </type>
    </element>
    <element>
      <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
        <valueBoolean value="true" />
      </extension>
      <path value="Observation.valueQuantity.unit" />
      <fixedString value="bpm" />
    </element>
    <element>
      <path value="Observation.valueQuantity.system" />
      <fixedUri value="http://unitsofmeasure.org" />
    </element>
    <element>
      <path value="Observation.valueQuantity.code" />
      <fixedCode value="/min" />
    </element>
    <element>
      <path value="Observation.device" />
      <type>
        <code value="Reference" />
        <targetProfile value="http://example.org/fhir/StructureDefinition/ECGDeviceMetric" />
      </type>
    </element>
  </differential>
</StructureDefinition>