Re: Beginner question: How to describe a subgraphs structure?

Hi Stéphane,

you will probably get disappointed when you start looking into RDF and
contexts, especially if you don't want to do research, but actual
development.. In fact, I did some work on this topic over the last few
years, and you might want to browse some of my articles, which also have
references to related work done by other people:
 http://www.know-who.net/publications

Best,
Heiko

On 8/23/07, Stéphane Monteil <stephane@engineering-studio.com> wrote:
>
> Hi Heiko,
>
> Thanks for your answer. Your illustration is pretty clear and
> straightforward and it looks well adapted to model my problem in a simple
> way.
>
> I will have to learn more about RDF containers to understand if there
> could
> be a benefit for me. At this stage, I don't really see why they exist as
> it
> looks possible to describe some groups of things directly with straight
> RDF
> ;-)
>
> The mention of reification led me to the notion of contexts that is
> actually
> a requirement for me.
> I work on a web application that allows to express some stories or
> memories
> through multimedia content. The stories are made of resources that can
> change dynamically, depending on the user's selections (like the time
> frame
> or the geographical region).
>
> Regards,
>
> Stephane
>
>
> ________________________________________
> De: Heiko Stoermer [mailto:hstoermer@gmail.com]
> Envoyé: jeudi 23 août 2007 16:02
> À: Stéphane Monteil
> Cc: www-rdf-logic@w3.org
> Objet: Re: Beginner question: How to describe a subgraphs structure?
>
> Hi,
>
>
> What you might want to experiment with is a combination of blank nodes,
> reification and the RDF container constructs (alt, bag, seq).
>
> From your example however I think that you don't really need that - it can
> be modeled with straight RDF, just as you verbalized it below, with sth
> like:
>
> event1 hasPicture pic1, pic1 takenBy person1
> event1 hasPicture pic2, pic2 takenBy person1
> event1 hasPicture pic3, pic3 takenBy person2
> event1 location loc1
> event1 date '2004-12-12'
>
> This will create a little graph that has event1 as the root element, with
> some properties like location and date, and some related pictures, each
> one
> with its photographer.
>
> Does this help? If not, you might want to submit a more detailed example
> ;)
>
> Best,
> Heiko
>
> On 8/23/07, Stéphane Monteil <stephane@engineering-studio.com> wrote:
>
> Hi all,
>
> I am a beginner with semantic web languages and my question is probably
> basic. Yet, I have not found a clear answer through the W3C documents I
> read
> so far.
>
> I would like to describe a graph (a set of triples) as a subject (a
> resource) by itself, and so on for a set of subgraphs.
> To express it differently, in my graphs some of the nodes could contain
> (reference) another graph.
>
> 1) Is it a consistent approach from a formal representation point of view?
> 2) Is it possible to represent that directly with RDF or any other
> standardized language (OWL, etc.)?
>
> My objective is to be able to consider a composite content of subjects as
> a
> subject by itself. The real world application could be for example to be
> able to manage a collection of pictures related to a specific event. Each
> picture is a subject (with several predicate - objects) and the grouping
> event is a higher level subject itself that can have semantic properties.
>
> Remark: The RDF Graph Modeling Language (RGML) seems to propose a kind of
> formal solution, but it does not look standardized and I would prefer to
> stay within something generic (ie: a graph can be a node).
>
> Thanks in advance for your help!
>
> Stephane Monteil
>
> Email:stephane@engineering-studio.com
> Web site: http://www.engineering-studio.com
>
>
>
>
>