Christoph,
Let's discuss this during tomorrow's IPP WG concall. My inclination is for us to use the form "om_SOURCE-SIZENAME_WIDTHxLENGTHmm" and "oe_SOURCE-SIZENAME_WIDTHxLENGTHin" for metric and imperial dimensions going forward unless "SOURCE" is one of the existing prefixes, mainly because a) media size names are less important today because we have "media-col", and b) existing Client implementation that use size names might not recognize new prefixes ("disc" and "roll" still cause some confusion/issues after 12 years...)
> On Dec 3, 2025, at 1:40 PM, Christoph Päper via ipp <ipp at pwg.org> wrote:
>> Dear PWG
>> The German standard DIN 678-1:1998-01 for envelope sizes, not fully obsoleted by DIN 476-2:2008-02 (which specifies the C series not part of ISO 216 = DIN 476-1), mentions a large size outside a series proper: E4 of 280 by 400 millimeters. If this were to be included as a media size self-describing name, which form would that take?
>> om_e4_280x400mm
> om_din-e4_280x400mm
> om_germany-e4_280x400mm
> din_e4_280x400mm
> iso_e4_280x400mm
> deu_e4_280x400mm
> ger_e4_280x400mm
> deu_din-e4_280x400mm
> ger_din-e4_280x400mm
>> Since the grammar in PWG MSN 2.1 section 5.1 only includes prefixes 'iso', 'jis', 'jpn', 'prc', 'om' and 'roll' for metric sizes, all but the first three and the fifth option probably disqualify, although the prose mentions that those are the "currently" defined classes of namespaces and jurisdictions. Since it is not part of an ISO standard, the fifth option is also out, but what if one wanted to add historic systematic sizes like 4A0, A11, A12, A13, B11, B12, B13 or the D series once specified in DIN 476?
> The original question boils down to: should there be a prefix before the label `e4` and should it give the standards body (DIN) or the country (Germany: DEU, GER)?
>> Similarily, the Canadian compromise size PA4 from withdrawn national standard CAN2-200.2-M79 could probably be registered by one of the following media size names:
>> om_pa4_210x280mm
> om_can-pa4_210x280mm
> om_canada-pa4_210x280mm
>> Although no name currently seems to contain a dot '.' outside the dimensions, it seems to be allowed by the grammar for `base-name`. Elongated sizes specified by ISO 5457:1999 would therefore be, if someone wanted to register them:
>> iso_a1.0_594x1189mm
> iso_a2.0_420x1189mm
> iso_a2.1_420x841mm
> iso_a3.0_297x1189mm
> iso_a3.1_297x841mm
> iso_a3.2_297x594mm
>> Although the name "Weltformat" apparently is still in colloquial use in some national advertisment printing businesses, particularly in Switzerland, there is disagreement about the proper size. Original sources seem to have specified the only ever-relevant number 14 (or XIV in Roman numerals) of the 'world format' as 905 by 1280 millimeters, whereas APG/SGA co-lists its F4 size of 895 by 1280 millimeters under that name. Not considering sibling formats, this still leaves a plethora of options and I would not know which to choose:
>> om_welt_905x1280mm
> om_welt-14_905x1280mm
> om_welt-xiv_905x1280mm
> om_weltformat_905x1280mm
> om_weltformat-14_905x1280mm
> om_weltformat-xiv_905x1280mm
> om_world_905x1280mm
> om_world-14_905x1280mm
> om_world-xiv_905x1280mm
> om_world-format_905x1280mm
> om_world-format-14_905x1280mm
> om_world-format-xiv_905x1280mm
>> om_f4_895x1280mm
> om_swiss-f4_895x1280mm
> om_apg-f4_895x1280mm
> om_sga-f4_895x1280mm
> om_apgsga-f4_895x1280mm
> om_apg-sga-f4_895x1280mm
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________________________
Michael Sweet