Re: RFC 2534 list of ua-media and paper-size values

Larry,
	I am certainly willing to look at the list and add new items
which seem necessary. I don't want to remove any item from the list
(archival availability being one of the things we're selling with
registered items), though we could update the registrations to note
parallel, preferred items.  I am not sure what changes to registration
process you are suggesting, though; can you clarify?
			best regards,
				 Ted Hardie





> 
> HTML 4.0 (http://www.w3.org/TR/html40) contains a list of devices
> ("media") that is used for selection of style sheets. This list
> of devices includes:
> 
> screen 	Intended for non-paged computer screens. 
> tty 	       Intended for media using a fixed-pitch character grid,
>               such as teletypes, terminals, or portable devices with
>               limited display capabilities. 
> tv            Intended for television-type devices (low resolution, color,
>               limited scrollability). 
> projection    Intended for projectors. 
> handheld      Intended for handheld devices (small screen, monochrome,
>               bitmapped graphics, limited bandwidth). 
> print         Intended for paged, opaque material and for documents viewed
>               on screen in print preview mode. 
> braille       Intended for braille tactile feedback devices. 
> aural         Intended for speech synthesizers. 
> all           Suitable for all devices. 
> 
> which seems to overlap the various conceptual spaces of CONNEG
> media featuresincluding RFC 2534's ua-media:
> 
>      screen           A refreshable display
>      screen-paged     a refreshable display which cannot scroll
>      stationery       Separately cut sheets of an opaque material
>      transparency     Separately cut sheets of a transparent material
>      envelope         Envelopes that can be used for conventional
>                       mailing purposes
>      envelope-plain   Envelopes that are not preprinted and have no
>                       windows
>      continuous       Continuously connected sheets of an opaque
>                       material
> 
> I would guess that HTML 4.0 "print" == CONNEG "ua-media=stationery"
> + some kind of range (unspecified) of resolution & pix-x & pix-y.
> 
> HTML has no notion of "transparency" or "screen-paged" (except
> maybe in combination with low resolution of "tv"), while CONNEG
> has no value for "braille" or "aural".
> 
> IPP (RFC 2566) in Appendix C has a different set of "media", where
> "media" includes size, and whether or not the paper is colored, etc.
> It's a pretty lengthy list, so I won't reproduce it here.
> 
> Anyway, I think we might want to take another look at the list
> of media values and update it, possibly providing for some other
> mechanism for registering new values.
> 
> I'm convinced that the approach taken by conneg of handling
> sizes separately from the nature of the medium is correct, but
> that we might want to revisit the list of paper sizes & media
> types to align IPP and CONNEG and HTML, possibly recycling
> updating RFC 2534.
> 
> Part of this would be so that IPP might consider using 
> CONNEG feature sets to talk about both capability and availability,
> and that HTML and CCPP might use the same vocabulary.
> 
> Larry
>