Re: [cmis] Thumbnails

[Al Brown <albertcbrown@us.ibm.com>]

On thumbnail's is it a single view like Atom Media (preview) or is it more generic and there is a set of renditions available? Both can be accomplished today by Atom with multiple links including the mime type for the client to choose.

Getting this capability into the domain model and the web services is a bit more effort. If it is a single preview image, I would treat as a content stream and have duplicate stream properties for thumbnail + new setThumbnail service. I don't think I would extend the create/checkin services to include thumbnails. I would also try to support both use cases for generating thumbnails - server and client. I would like it optional for repositories that may not have thumbnails or renditioning capabilities.

Supporting renditions of content I would not want to see in CMIS 1.0 as I think it is not commonly implemented enough as well as not being an 80% (though useful) use case.

-Al

Al Brown
Emerging Standards and Industry Frameworks
CMIS: https://w3.tap.ibm.com/w3ki07/display/ECMCMIS/Home
Industry Frameworks: https://w3.tap.ibm.com/w3ki07/display/ECMIF/Home

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David Caruana ---03/29/2009 02:26:27 PM---At the last Face 2 Face there was interest in supporting document

From:	David Caruana <david.caruana@alfresco.com>
To:	cmis@lists.oasis-open.org
Date:	03/29/2009 02:26 PM
Subject:	[cmis] Thumbnails

---

At the last Face 2 Face there was interest in supporting document  
thumbnails.

For AtomPub there are some initiatives for representing media content  
within feeds, although none seem to be widely accepted. Two that stick  
out for me...

1) Media RSS - http://search.yahoo.com/mrss - as the name implies,  
originally developed for RSS, but due to Atom's extensibility, may  
also be embedded in Atom. In summary, this initiative is comprehensive  
(or complex depending on your point of view), although ambiguous in  
places. The main use-case, I believe, is to drive Yahoo! video search.  
Google also use in their Data API.

2) Atom Media- http://www.apparently.me.uk/22448.html - an initiative  
to provide an Atom specific simplified alternative of Media RSS.  
Basically, extends Atom link='enclosure' and introduces  
link='preview', specifically for reduced fidelity representations such  
as thumbnails.

I haven't seen any equivalent in the SOAP world.

There are two approaches we can take to introducing thumbnails into  
CMIS.

a) Leverage a complementary initiative that specifically supports  
thumbnails (like the above) - no winner here, and perhaps lacking in  
SOAP.

b) Introduce the notion of thumbnail into the CMIS data model and  
provide explicit supporting services (e.g. hook into getContentStream,  
or support multiple content streams) - simple, concise, but not  
necessarily compatible with broader non-ECM use cases.

I'd be interested to hear what others think about introducing  
thumbnails.

Regards,
Dave


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