2.0 http://www.w3.org/2005/Atom Groupdocs API References – HIBCLICSecondaryAdditionalData https://reference.groupdocs.com/signature/net/groupdocs.signature.domain.extensions/hibclicsecondaryadditio......Identifies lot or batch number. Lot/batch number must be alphanumeric...property Identifies serial number. Serial number must be alphanumeric...