EPUB 3: update allowed values for metadata`identifier.scheme` (ONIX codelist issue 72)

[Wandmalfarbe]

The EPUB 3 metadata for identifiers uses the ONIX codelist 5 scheme to indicate the product identifier type (e.g., ISBN or DOI etc.). The pandoc supported list of scheme values could be updated to support newer values from ONIX codelist Issue 72 (published January 2026). The last supported value OLCC in the list has been added in ONIX codelist Issue 18 (published August 2012).

        schemeToOnix :: Text -> Text
        schemeToOnix "ISBN-10"              = "02"
        schemeToOnix "GTIN-13"              = "03"
        schemeToOnix "UPC"                  = "04"
        schemeToOnix "ISMN-10"              = "05"
        schemeToOnix "DOI"                  = "06"
        schemeToOnix "LCCN"                 = "13"
        schemeToOnix "GTIN-14"              = "14"
        schemeToOnix "ISBN-13"              = "15"
        schemeToOnix "Legal deposit number" = "17"
        schemeToOnix "URN"                  = "22"
        schemeToOnix "OCLC"                 = "23"
        schemeToOnix "ISMN-13"              = "25"
        schemeToOnix "ISBN-A"               = "26"
        schemeToOnix "JP"                   = "27"
        schemeToOnix "OLCC"                 = "28"
        schemeToOnix _                      = "01"

There is an HTML version available of the latest ONIX codelist Issue 72 at https://ns.editeur.org/onix/en/5. New additions to pandoc could be:

Code	Heading
29	JP Magazine ID
30	UPC-12+5
31	BNF Control number
34	ISSN-13
35	ARK
36	Digital file internal version number

I also noticed that code 24 Co-publisher’s ISBN-13 is missing from pandoc.

[jgm]

Want to submit a PR?

[Wandmalfarbe]

I'd love to. Maybe this week.