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Below is a fragment from a DRS batch transaction file that contains a request to create a PID using the urnMask element {n}:
<transaction>
<owner>HUL.Test</owner>
<add>
<urnMap>
<file>xml2.jp2</file>
<urnmask>urn-3:HUL.Test:{n}</urnmask>
</urnMap>
</add>
</transaction>
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