delta

<?xml version="1.0" encoding="UTF-8"?>

<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="observation-delta"/> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="oo"/> 
  </extension> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1"/> 
  </extension> 
  <url value="http://hl7.org/fhir/StructureDefinition/observation-delta"/> 
  <identifier> 
    <system value="urn:ietf:rfc:3986"/> 
    <value value="urn:oid:2.16.840.1.113883.4.642.5.1477"/> 
  </identifier> 
  <version value="5.0.0-ballot"/> 
  <name value="delta"/> 
  <title value="delta"/> 
  <status value="draft"/> 
  <experimental value="false"/> 
  <date value="2015-03-02"/> 
  <publisher value="Health Level Seven, Inc. - OO WG"/> 
  <contact> 
    <telecom> 
      <system value="url"/> 
      <value value="http://hl7.org/special/committees/orders"/> 
    </telecom> 
  </contact> 
  <description value="The qualitative change in the value relative to the previous measurement. Usually only
   recorded if the change is clinically significant."/> 
  <fhirVersion value="5.0.0"/> 
  <mapping> 
    <identity value="rim"/> 
    <uri value="http://hl7.org/v3"/> 
    <name value="RIM Mapping"/> 
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  <context> 
    <type value="element"/> 
    <expression value="Observation"/> 
  </context> 
  <type value="Extension"/> 
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension"/> 
  <derivation value="constraint"/> 
  <snapshot> 
    <element id="Extension">
      <path value="Extension"/> 
      <short value="Qualitative change or trend in the measurement"/> 
      <definition value="The qualitative change in the value relative to the previous measurement. Usually only
       recorded if the change is clinically significant."/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="Extension"/> 
        <min value="0"/> 
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    </element> 
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      <short value="Unique id for inter-element referencing"/> 
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      <isSummary value="false"/> 
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        <identity value="rim"/> 
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    </element> 
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      <path value="Extension.extension"/> 
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        <discriminator> 
          <type value="value"/> 
          <path value="url"/> 
        </discriminator> 
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      <type> 
        <code value="Extension"/> 
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        <key value="ele-1"/> 
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        <xpath value="@value|f:*|h:div"/> 
        <source value="http://hl7.org/fhir/StructureDefinition/Element"/> 
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      <constraint> 
        <key value="ext-1"/> 
        <severity value="error"/> 
        <human value="Must have either extensions or value[x], not both"/> 
        <expression value="extension.exists() != value.exists()"/> 
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      <representation value="xmlAttr"/> 
      <short value="identifies the meaning of the extension"/> 
      <definition value="Source of the definition for the extension code - a logical name or a URL."/> 
      <comment value="The definition may point directly to a computable or human-readable definition of the
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       The definition SHALL be a URI for the Structure Definition defining the extension."/> 
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        <code value="http://hl7.org/fhirpath/System.String"/> 
      </type> 
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/observation-delta"/> 
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      <isSummary value="false"/> 
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        <identity value="rim"/> 
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      <short value="Value of extension"/> 
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  </snapshot> 
  <differential> 
    <element id="Extension">
      <path value="Extension"/> 
      <short value="Qualitative change or trend in the measurement"/> 
      <definition value="The qualitative change in the value relative to the previous measurement. Usually only
       recorded if the change is clinically significant."/> 
      <min value="0"/> 
      <max value="1"/> 
    </element> 
    <element id="Extension.extension">
      <path value="Extension.extension"/> 
      <max value="0"/> 
    </element> 
    <element id="Extension.url">
      <path value="Extension.url"/> 
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/observation-delta"/> 
    </element> 
    <element id="Extension.value[x]">
      <path value="Extension.value[x]"/> 
      <min value="1"/> 
      <type> 
        <code value="CodeableConcept"/> 
      </type> 
    </element> 
  </differential> 
</StructureDefinition>