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Resolved in https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippjobprinterext3v11-20190710-5100.13.docx
Concerning IPP job constraints and resolution, "job-constraints-supported" is a set of collections, where each collection contains the following member attributes - "resolver-name": specifies an identifier of a collection in "job-resolvers-supported" - 2+ Job Template attributes and corresponding values The semantic is as follows: if the Job Template attributes in a collection is matched by the current settings, there is a conflict; resolve the conflict using the resolver with specified resolver name. There may be cases where multiple values for a Job Template attribute may be considered a match. For instance, for handling a constraint between two sided printing and the transparency media type, a Printer might list the following: job-constraints-supported= { resolver-name=“A” sides="two-sided-short-edge" media-col={ media-type="transparency" } }, { resolver-name=“A” sides="two-sided-long-edge" media-col= { media-type="transparency" } } job-resolvers-supported= { resolver-name=“A” sides="one-sided" media-col= { media-type="stationery" } } To reduce the number of collections in job-constraints-supported, the Job Template attributes can be specified of a "1setOf <type-def-for-job-template-attribute>", so that multiple values may be listed, like so: job-constraints-supported= { resolver-name=“A” sides="two-sided-long-edge","two-sided-short-edge" media-col={ media-type="transparency" } } job-resolvers-supported= { resolver-name=“A” sides="one-sided" media-col={ media-type="stationery" } } However, reading section 5.6.8, doing this isn't clearly legal. Update the text in section 5.6.8 to make it unambiguously clear that this second form is allowable.