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Subject: Re: [office] Announcement of work on ODF 1.2 metadata feature adoptions

Dear TC members,

I have divided the changes mentioned below into four minor proposals and 
added them to our ODF 1.2 task list [1].
The proposals will be finalized till 10th of December including all 
suggested wordings.


[1]  http://wiki.oasis-open.org/office/OpenDocument_v1.2_tasks

Svante Schubert wrote:
> After the review of our RDF metadata feature by the inventors of RDF, 
> the W3C Semantic Web Interest Group (SWIG), two weeks ago at the TPAC 
> 2008, I received a lot of positive feed-back.
> Nevertheless even good features have potential of improvement, 
> therefore I have three subjects I am working on to bring the ODF RDF 
> feature to close perfection, driven by the feed-back from SWIG and Tim 
> Berners-Lee especially.
> Here the rough descriptions of the three topics, a detailed proposal 
> will follow:
> 1)
> We are using RDFa attriubtes and the W3C RDFa spec [1] has received 
> Recommendation status less than 3 weeks ago.
> The usage of the four RDFa elements can now be done accordingly to the 
> W3C spec. Even with XHTML namespace due to the XHTML modularization 
> statement that all no namespace XHTML attributes can rather use the 
> XHTML namespace [2].
> The usage of the attribute definitions from the original spec will 
> give us furthermore the abbreviation mechanism as compact URIs (CURI), 
> which can help a lot in large spreadsheets.
> Other RDFa features, e.g. Chaining [3], are rather meant for DOM 
> applications and will not apply to ODF applications.
> 2)
> Although ODF applications do not need this for themselves, we should 
> help other none-ODF RDF applications to receive the RDF graphs from 
> our package, to let ODF become successful.
> For this reason I will work on two XSLT transformations (according to 
> the W3C GRDDL standard [4]) that will help foreign users/crawlers to 
> extract RDF data from ODF.
> My basic idea is that styles.xml and content.xml will receive a 
> reference to one XSLT stylesheet based on [5] to extract RDFa and 
> another XSLT for the meta.xml, making RDFa statements from every 
> sub-element of office:meta (e.g. <document> meta:creation-date 
> "2007-05-10T18:18:56".).
> ODF application should ignore these GRDDL attributes located at the 
> root element, with an URL pointing to the stylesheet somewhere hosted 
> at OASIS. These stylesheets are only guidance for foreign applications.
> 3)
> The SWIG where rather puzzled by the usage of generated URNs in the 
> ODF/RDF examples. The web lives from URLs, so will be the Semantic 
> Web. Aside of this, there is a design rule in the "Architecture of the 
> World Wide Web" not to create alias [6]. Everybody strongly suggested 
> to use relative URLs within the package and to reference to the 
> resources within the package with URLs.
> Unfortunately that triggers the problem of referencing from outside 
> inside the ODF package by URLs, when making these relative URLs absolute.
> In general there are three possibilities:
> a) Using an URL that thinks of a package similar as an directory
> b) A package schema similar to 'jar:' that has never been standardized
> c) Create own fragment identifier for our mimetypes.
> Currently I believe a) & b) are valid and desired options, but out of 
> the scope of our TC (not to mention the time frame), therefore I have 
> asked to discuss this general package related problem at the W3C Web 
> Technical Architecture Working group (further details at [7] and thread).
> I am currently at the OpenOffice.org Conference in Beijing, I would be 
> happy to discuss these topics with you face to face, but would ask the 
> group not to start a larger discussion on these topics until a 
> detailed proposal is given to the TC to base a discussion on.
> Regards,
> Svante
> [1] http://www.w3.org/TR/rdfa-syntax/
> [2] 
> http://www.w3.org/TR/xhtml-modularization/abstract_modules.html#s_commonatts 
> [3] http://www.w3.org/TR/rdfa-syntax/#sec_5.3.
> [4] http://www.w3.org/TR/grddl/
> [5] http://www.w3.org/2008/07/rdfa-xslt
> [6] http://www.w3.org/TR/webarch/#avoid-uri-aliases
> [7] http://lists.w3.org/Archives/Public/www-tag/2008Oct/0126.html
> Sun Microsystems GmbH           Svante Schubert
> Nagelsweg 55                    Software Engineer
> 20097 Hamburg                   StarOffice / OpenOffice.org Development
> Germany                         Phone: +49(0)40 236 46 500
> http://www.sun.com              Svante.Schubert@sun.com
> Sitz der Gesellschaft:
> Sun Microsystems GmbH, Sonnenallee 1, D-85551 Kirchheim-Heimstetten
> Amtsgericht Muenchen: HRB 161028
> Geschaeftsfuehrer: Wolfgang Engels, Dr. Roland Boemer
> Vorsitzender des Aufsichtsrates: Martin Haering
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