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RE: f2f planning - Issue 63

From: Larry Masinter <masinter@adobe.com>
Date: Sun, 22 Nov 2009 14:23:40 -0800
To: "ashok.malhotra@oracle.com" <ashok.malhotra@oracle.com>, "www-tag@w3.org" <www-tag@w3.org>
Message-ID: <8B62A039C620904E92F1233570534C9B0118DC8FB1D5@nambx04.corp.adobe.com>
> * Metadata model: what is the "data model" for typical metadata applications - 
> the datatypes of the endpoints?
> The model is RDF.  We recommend that all metadate be encoded as RDF.

RDF 'has' a data model -- things you can say. The question remains, I think,
whether it is useful, productive, and appropriate to allow "anything you can
say in RDF" to also be said in metadata.  I think the requirements for
metadata processing may mean that some relations have a much more restricted
domain.

> Metadata in other formats e.g. RDDL, should be translatable into RDF, or 
> encapsulated in a RDF wrapper.

It's going the other way that is also important. Imagine an audio player
(WinAmp, iTunes,  Windows Media Player) in which you had not just title
and artist and duration, and so on, but allowed any of those to be
arbitrary RDF assertions. I think the media player would suffer if it weren't
possible to restrict the data model of "artist" to be arbitrary rather
than the dc:creator.


> * Metadata serialization: how can metadata be encoded in a representation system, 
> be it RDF or something else
> Metadata is serialized using standard RDF serialization.

Yes, RDF is one serialization.


> * Metadata vocabularies:  what are appropriate vocabularies for describing various 
> media objects and network services? What is the process by which new vocabularies 
> can or should be developed, described, extended or changed?
> There exist RDF vocabularies for several domains.  Others need to be created.

I think it's easy to create vocabularies; the real difficulty is vocabulary
mapping and also the scalability of metadata when merging metadata from multiple
sources.

> * Metadata linking: What are the various ways in which metadata can be associated 
> with "data" or other resources? Link relationships, protocol elements, mechanisms 
> for embedding metadata in various kinds of data?
> I think this is issue 62: http://www.w3.org/2001/tag/group/track/issues/62

Issue 62 focuses on one way of linking; I don't think it is or should be the
only way.

Larry
Received on Sunday, 22 November 2009 22:24:14 GMT

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