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    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
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    <type value="element" />
    <expression value="Element" />
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    <element id="Extension.url">
      <path value="Extension.url" />
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    <element id="Extension.value[x]">
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        <rules value="open" />
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        <code value="CodeableConcept" />
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</StructureDefinition>