All,
I received a request for a particular Japanese envelope size "Kaku 1", which would have the media size name 'jpn_kaku1_270x382mm'. The registration template is as follows:
Attributes (attribute syntax)
Keyword Attribute Value Reference
----------------------- ---------
media (type2 keyword | name(MAX)) [RFC8011]
jpn_kaku1_270x382mm [APPLE20171002]
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Michael Sweet, Senior Printing System Engineer