OASIS Open Document Format for Office Applications (OpenDocument) TC

View Only

Back to discussions

Expand all | Collapse all

Re: [office] Mapping OpenDocuemnt metadata to RDF

1. Re: [office] Mapping OpenDocuemnt metadata to RDF

Recommend

Lars Oppermann

Posted 09-14-2005 09:44

MHonArc v2.5.0b2 -->

office message

Subject: Re: [office] Mapping OpenDocuemnt metadata to RDF

From: Lars Oppermann <Lars.Oppermann@Sun.COM>
To: office@lists.oasis-open.org
Date: Wed, 14 Sep 2005 11:43:45 +0200

To better illustrate what I was talking about, I have attached four graphs.

The first one (graph1.png) would be an expression of (a part of) 
OpenDocuemnt's meta-data in RDF. I think it's the most straight forward 
way to do it.

In order to extend the metadata, one would create a graph like in the 
second illustration (graph1_5.png). This however, is the point where I 
am unsure whether it is the 'right way' (in the semantic-web world) to 
do this, since it might be a good idea to be able to express the 
relationship of the dc:creator and ex:author prefixes.

So, rather then making the statements realting to the prefixes which are 
defined by the OpenDocuemnt meta-data schema directly, one could use an 
indirection via some blank nodes, that have a well-known nodeID. (Is 
there some mechanism in rdf, that would be better suited to do this?). 
We would then map the object from the OpenDocument metadata statement to 
a statement about that node. This is illustrated in graph2.png.

If one was to make further statements about something that is already 
described in part by the OpenDocument metadata, he could make a new 
statement about that indirection node. Thus this statement could be 
associated with the the subject that the original OpenDocument metadata 
was describing (e.g. the author/creator) as is shown in graph3.png

I am currently at a loss to whether a mechanism as described in last two 
paragraphs is usefull, and whther this is a clean way to design it. For 
instance, the duplication of dc:author and dc:date prefixes (as denoted 
by the red squares and double-arrows) seems to be somewhat out of place.

I hope that those of you that have more experience in the semnatic web 
field can tell me what would be the best direction here...

All the best,
~Lars


-- 
Lars Oppermann <lars.oppermann@sun.com>               Sun Microsystems
Software Engineer - StarOffice                           Sachsenfeld 4
Phone: +49 40 23646 959                                D-20097 Hamburg
Fax:   +49 40 23646 550                  http://www.sun.com/staroffice