[IPP] JPS3 comment on xxx-preferred
Peter.Zehler at xerox.com
Sun Jan 15 12:21:22 EST 2012
Why do we have a bunch of xxx-preferred attributes? It complicates the
model with a bunch of attributes and is not general purpose enough to
address all the possible conflicting attributes and values.
Is there any reason we cannot provide this functionality in a manner
similar to "unsupported-attributes". The "unsupported-attributes" is
handled in IPP as an out of band group in an IPP response. We could
extend the encoding of out of band attributes to include a new group for
"xxx-preferred" . That way any substituted or conflicting attributes
and values could be returned for a Validate operation.
I would prefer to handle "xxx-preferred" using the collection syntax. I
think it is easier and requires fewer changes to the IPP encoding.
Defining "attributes-preferred" as a collection of attributes and
permitting any template attributes to be included would be a simple
generalization. It would also allow a client to pick those
attribute/values out to correct their request and not rely on printer
Xerox Research Center Webster
Email: Peter.Zehler at Xerox.com <mailto:Peter.Zehler at Xerox.com>
Voice: (585) 265-8755
FAX: (585) 265-7441
US Mail: Peter Zehler
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Webster NY, 14580-9701
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