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AW: Linking to an event from FOAF

From: Leo Sauermann <leo@ist.org>
Date: Tue, 30 Sep 2003 12:18:32 +0200
To: "'Libby Miller'" <Libby.Miller@bristol.ac.uk>, "'Vinay Pawar'" <zoyd@gmx.net>
Cc: <www-rdf-calendar@w3.org>
Message-ID: <000001c3873c$33e1f620$0e01a8c0@Bundeslade>

From my experience in gnowsis, 
I can report this way of "doing it",
which is near-realistic.

I will shortly define what a SUBJECTIVE URL and a PUBLIC URL is and how
the data can be created and communicated.

I am the publisher and make an entry in my personal Outlook Calendar.
There I have a SUBJECTIVE url that works for me. It is build using my
personal computer hostname (leo.gnowsis.com this is the pc i am sitting
at right now) and the ms-outlook ITEMID
this is the url:

Then I can extract the outlook data to rdf (this is a dump I just did
with a query, it extracted this on the fly from gnowsis using RQL):
DAFE2255CD8AE9A24422600> ?y ?z)
http://www.gnowsis.org/ont/msoutlook/0.1#Duration 30
http://www.gnowsis.org/ont/msoutlook/0.1#End 2003-09-30T12:00:00
http://www.w3.org/2000/01/rdf-schema#label Answer Calendar discussion
http://www.gnowsis.org/ont/msoutlook/0.1#Start 2003-09-30T11:30:00
http://www.gnowsis.org/ont/msoutlook/0.1#AllDayEvent 0

I want to mention here, that the query is run "on the fly" and extracts
the data out of outlook, there is no buffering of these values in a RDF
datastore. This is similiar to the way many RDF people build
python/Perl/whatever converters of iCal.

This should be transformed to iCal somehow (uhmm, XSLT for RDF is still
missing, *sigh*)

Then post it per ftp on wome webserver 
OR post it via soap in some PUBLIC calendar.

There you get a PUBLIC URL (in contrary to the subjective, personal uri)
you can do owl:SameAs to the SUBJECTIVE URL.
The url could be:
(date not correct)

The public url is both:
Place WHERE to find the data and IDENTIFER for the single event.
I think in semantic web age, a uid like
0a780655c6a8437d62b02cf24e0381837b870963 is not very witty.

Then you communicate the PUBLIC URL to all people that are interested. 

They connect it in their personal semantic web (f.e. they use my gnowsis
system as PKM tool in conjunction with outlook, Ical, whatever...)

After the meeting, all attendees can be published connected to the
PUBLIC URI using FOAF or whatever suits it.

With this approach as I have shown it, it is possible - using todays
technology - to enter, communicate and link an appointment. Using
standard software like outlook.
An unanswered question is the PUBLIC calendar that provides the PUBLIC
URL. Examples for this public calendar are not known to me but surely to
the rdf-calendar community.

Leo Sauermann

-----Ursprüngliche Nachricht-----
Von: www-rdf-calendar-request@w3.org
[mailto:www-rdf-calendar-request@w3.org] Im Auftrag von Libby Miller
Gesendet: Montag, 29. September 2003 21:32
An: Vinay Pawar
Cc: www-rdf-calendar@w3.org
Betreff: Re: Linking to an event from FOAF

thanks for sending this Vinar.

the ical:url proposal is interesting.

RFC 2445 says

[[ Uniform Resource Locator

   Property Name: URL

   Purpose: This property defines a Uniform Resource Locator (URL)
   associated with the iCalendar object.


   Description: This property may be used in a calendar component to
   convey a location where a more dynamic rendition of the calendar
   information associated with the calendar component can be found. ]]

so that's actually more like your seealso property - i.e. a more up to
date version (as I interpret it anyway).

I think the uid is important, as it allows you to point to a specific
event (not a calendar) and many events will not necessarily have a
homepage. However this only works if there is already an event
description with a url somewhere that's 'authoritiative' somehow. There
may not be such a thing, or you might create one first and then the
conference does, so you might get people linking to yours and not the
conference's one, and so on.

I think combining foaf and RDFical is well worth persuing though I'm not
sure what the right answer is.

see also:


On Mon, 29 Sep 2003, Vinay Pawar wrote:

> Hi,
> At #rdfig we were trying to find out a way to link to
> a particular event from a FOAF file. In no time Libby had this 
> example:
>   http://swordfish.rdfweb.org/discovery/2003/09/foafcal/foafattend.rdf
> That seems great for birthday parties. But a conference would most 
> probably have it's own RDF calendar published. Following is what I'm 
> suggesting:
> <ical:Vevent>
>   <ical:attendee rdf:nodeID="me"/>
>   <rdfs:seeAlso
>   <ical:uid>0a780655c6a8437d62b02cf24e0381837b870963</ical:uid>
>   <ical:summary>www2004</ical:summary>
>   <ical:url rdf:resource="http://www2004.org"/>
> </ical:Vevent>
> Here ical:uid is used to point to an event within events.rdf. And 
> ical:url is used instead of foaf:homepage, because it seems more 
> appropriate.
> Comments?
> Thanks,
> Vinay
Received on Tuesday, 30 September 2003 06:20:59 UTC

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