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    isMixin="true"
    hasOrderableChildNodes="false"
    primaryItemName="">
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      <propertyDefinition
        name="exo:transcription"
        requiredType="Binary"
        autoCreated="false"
        mandatory="true"
        onParentVersion="COPY"
        protected="false"
        multiple="false">
        <valueConstraints />
      </propertyDefinition>
    </propertyDefinitions>
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