PS> Semantic model: media handling

PS> Semantic model: media handling

Harry Lewis harryl at us.ibm.com
Wed Jul 17 11:34:40 EDT 2002


I like Bob's analysis. I think the Semantic Model will be most useful 
taking this approach.
---------------------------------------------- 
Harry Lewis 
IBM Printing Systems 
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"TAYLOR,BOB (HP-Vancouver,ex1)" <robert_b_taylor at hp.com>
Sent by: owner-ps at pwg.org
07/16/2002 09:13 PM
 
        To:     Norbert Schade <norbertschade at attbi.com>, Print Services group 
<ps at pwg.org>
        cc:     UPD group <upd at pwg.org>
        Subject:        RE: PS> Semantic model: media handling

 

Hi Norbert, all,
 
One of the things we (HP) have been suggesting for the semantic model is 
the separation of the raw "attribute/element" definitions from the 
structures/model that pull them together for a particular use.  As you 
not, UPDF has done this structuring in a different way than IPP - which is 
also somewhat different than UPnP & PSI, etc.  I'm not sure we want to try 
codify any one structure as part of the core semantic model - these will 
tend to vary by market segment and domain, and I'm not sure we can do this 
one-size-fits-all.  What we would like to see, though, is common 
definition of the
core "attributes/elements" - this seems much more reusable across models & 
domains.  It does make sense, though, to publish some of the "common 
models" as at least examples of structural models - IPP, UPDF, etc. are 
likely candidates for this.  This exposes some of useful constructs (such 
as the composite feature you describe below) for reuse.
 
thanks,
 
bt
 
---------------------------------------------------
Bob Taylor 
Senior Architect 
IPG Strategic Technology Development 
Hewlett-Packard Co.      
mailto:robertt at vcd.hp.com 
phone: 360.212.2625/T212.2625 
fax: 208.730-5111 
--------------------------------------------------- 
-----Original Message-----
From: Norbert Schade [mailto:norbertschade at attbi.com]
Sent: Monday, July 08, 2002 7:32 AM
To: Print Services group
Cc: UPD group
Subject: PS> Semantic model: media handling

I have problems to follow two different ways to specify media handling and 
UPDF would have problems to support that.
I'm fine with the specification of single media attributes like size, 
type, etc.
I agree that there should exist a media instance a level higher, which is 
a media element with a number of media attributes.
The number of attributes can vary. In one sample it may be just size and 
type, in another it may be something like the IPP media collection.
 
My point is that the attributes a media is described by may vary.
There should not be a predefined media collection in a common Semantic 
Model representing one implementation.
 
Feel free to check the composite feature definition we have in UPDF. Open 
the UPDF.xsd schema to do this and follow the path down to 
PrintCapabilities.Features. The current sample description xml of an 
imaginary LJ9000 has a 'Media' composite feature.  We can compose any 
number of features to a new feature, be it Media, Quality or anything 
else. This is a very flexible structure and is expected to be used 
frequently. We got very positive feedback once we finished it last year.
 
We'd appreciate if  the Semantic Model does something down that path. 
Otherwise the spec is ambiguous.
 
 
Another statement:
We've seen the current schema of the Semantic Model. We know there are a 
number of ways to write schemas. The UPDF group made the experience that 
working with attributes instead of assigning text to elements directly has 
advantages. Validation is easier and we can define constraints (these are 
really constraints and not dependencies) for attributes. You may think 
that over.
 
Regards
 
Norbert Schade
69 Prescott Drive
North Chelmsford, MA 01863
978-251-1017
norbertschade at attbi.com
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