CMSSW/Geometry/HcalAlgo/test/data/world.xml
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<?xml version="1.0"?>
<DDDefinition xmlns="http://www.cern.ch/cms/DDL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.cern.ch/cms/DDL ../../../DetectorDescription/Schema/DDLSchema.xsd">

<PosPartSection label="">
  <PosPart copyNumber="2">
    <rParent name=":world_volume"/>
    <rChild name="cms:OCMS"/>
  </PosPart>
</PosPartSection>

</DDDefinition>