All,
I have completed implementation of all required operations and attributes in the current draft of the IPP System Service v1.0 in the ippserver sample code, including support for template-printer and template-job resources, mapping of static-strings resources to printer-strings-uri and printer-strings-languages-supported when allocated to a printer, and the Register-Output-Device operation for proxies.
I've identified a few additional typographical issues in the January 30, 2019 version of the current IPP System Service draft and will post an updated stable draft early next week.
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Michael Sweet, Senior Printing System Engineer