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It depends.

The canonical form of a DPID is without a hyphen. Hence DPIDs should be used, in DDEX messages, without hyphens:

Do communicate DPIDs withOUT hyphens


Do NOT communicate DPIDs with hyphens


However, for human consumption hyphens may be added. Therefore, the HTML/PDF export of the DPID registry contains hyphens whereas the XML export does not.

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