Dan Brickley | 1 Mar 11:19 2009

[foaf-dev] (static) functional properties for distinguishing people?


Hi foaf-dev,

Apart from one's natural date of birth, what other properties do you 
folk consider to be "functional" (and statically so)? I'm asking with 
regard to telling when two descriptions are of different people.

In RDF/OWL a property is functional if, for some particular thing, there 
is at most one true value for any specified property. Since RDF and OWL 
don't take time or context into account, this leaves a grey area around 
properties such as "age". I don't want to get into that modeling issue 
right now, but I am interested to look for plausible properties that can 
be used when comparing people descriptions, so we can say "if these two 
descriptions are both true, then they must be descriptions of two 
different people".

Historically we have focussed more on the complementary situation: 
figuring out when two descriptions are about the self-same thing (in 
FOAF, typically Person). This is useful, but we've neglected the need to 
distinguish people.

If I'm given:

a.rdf: <Person><homepage rdf:resource="http://danbri.org"/></Person>

b.rdf: <Person><homepage 
rdf:resource="http://qwertyuip.example.org"/></Person>

... nothing in RDF's logic prevents those from being about two different 
people. But they might also be descriptions of the same person.
(Continue reading)

Simon Reinhardt | 1 Mar 12:30 2009
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Re: [foaf-dev] (static) functional properties for distinguishing people?

Dan Brickley wrote:
> I can't think of any right now, and suspect the mix of technical and 
> social considerations involved make this approach eternally infeasible. 
> Just wanted to check I wasn't blanking out and missing something 
> obvious. I assume we'll get by with hacks and heuristics rather than 
> pure logical guarantees. Sometimes the data world is messy for good 
> reason :)

Indeed. Since there are other people with my name on the web I first put some statements into my FOAF file
where I'm describing those people with what I could find about them on the web and then stated that they are
owl:differentFrom me. The idea being that I don't get associated with them and that those stupid people
search engines could make use of that in the future.
However I decided not to publish that version of my FOAF file because ultimately it seemed to be a better idea
to leave this fuzziness intact for privacy reasons.

Regards,
  Simon
Dan Brickley | 2 Mar 17:37 2009

[foaf-dev] [Fwd: Civic Hacking, the Semantic Web, and Visualization]

Fwd:'ing from the SemWeb IG list, as these are topics dear to the heart 
of many FOAFy and MySociety people...

Wish I'd been there :)

Dan

-------- Original Message --------
Subject: Civic Hacking, the Semantic Web, and Visualization
Resent-Date: Mon, 02 Mar 2009 16:27:48 +0000
Resent-From: semantic-web@...
Date: Mon, 02 Mar 2009 11:27:04 -0500
From: Joshua Tauberer <jt@...>
To: semantic-web at W3C <semantic-web@...>

Yesterday I held a session called Semantic Web II: Civic Hacking, the
Semantic Web, and Visualization at Transparency Camp [1], an
unconference about the intersection of technology and transparency in
the U.S. government. My talk was about the application of the semantic
web to government data, and a dream of being able to create
visualizations by just typing in SPARQL queries. I've posted my slides
[2] and some notes [3]. Thought it might be of interest.

This followed another talk there by George Thomas, from the U.S.
government website recovery.gov [4], on how the site will put
information on the government's economic stimulus spending into the
semantic web and the Linked Open Data world via Atom, XHTML, and RDFa.
[5]. (Very cool.)

[1] http://transparencycamp.org/
(Continue reading)

Dan Brickley | 6 Mar 11:29 2009

[foaf-dev] [Fwd: Re: [VCARDDAV] More types for RELATED]


 From the revitalised vcard list...

It seems the vcards-within-vcards mechanism is being depracated, but 
there is some discussion of having named relationships to other parties.

Dan

-------- Original Message --------
Subject: Re: [VCARDDAV] More types for RELATED
Date: Fri, 06 Mar 2009 11:19:02 +0100
From: Dan Brickley <danbri@...>
To: Zoltan.Ordogh@...
CC: vcarddav@...

On 6/3/09 10:58, Zoltan.Ordogh@... wrote:
>> XFN also defines:
>>
>> acquaintance
>> colleague
>> co-worker
>> co-resident
>> neighbor
>> muse
>> crush
>> date
>> sweetheart
>> met (someone you've met in real life)
>
> Do we really need these? I would rather has a short list with static info.
(Continue reading)

Alexandre Passant | 8 Mar 14:19 2009

[foaf-dev] Extended deadline - 1st International Workshop on Trust and Privacy on the Social and Semantic Web (SPOT 2009)

(Apologies for multiple posts)

Due to multiple requests we have decided to extend the deadline for the
SPOT2009 - Trust and Privacy on the Social and Semantic Web workshop at
ESWC09 to

11 March 2009, 11:59pm UTC

The deadline extension is provided for (short and long) papers as well  
as
demos and applications.
Please note that this is a hard deadline which will not further be  
extended.

============================================================
                       LAST CALL FOR PAPERS - EXTENDED DEADLINE

=============================================================

               1st International Workshop on
      Trust and Privacy on the Social and Semantic Web
                        (SPOT 2009)
                http://spot2009.semanticweb.org

                    in conjunction with
      The 6th European Semantic Web Conference (ESWC2009)

                     Heraklion, Greece
                       June 1st, 2009

(Continue reading)

Dan Brickley | 9 Mar 10:10 2009

[foaf-dev] [Fwd: [VCARDDAV] I-D Action:draft-ietf-vcarddav-webdav-mkcol-04.txt]


vCard folk are adding more extensibility mechanisms...

-------- Original Message --------
Subject: [VCARDDAV] I-D Action:draft-ietf-vcarddav-webdav-mkcol-04.txt
Date: Sun,  8 Mar 2009 21:15:01 -0700 (PDT)
From: Internet-Drafts@...
To: i-d-announce@...
CC: vcarddav@...

A New Internet-Draft is available from the on-line Internet-Drafts 
directories.
This draft is a work item of the vCard and CardDAV Working Group of the 
IETF.

	Title           : Extended MKCOL for WebDAV
	Author(s)       : C. Daboo
	Filename        : draft-ietf-vcarddav-webdav-mkcol-04.txt
	Pages           : 12
	Date            : 2009-03-08

This specification extends the Web Distributed Authoring and
Versioning (WebDAV) MKCOL method to allow collections of arbitrary
resourcetype to be created and to allow properties to be set at the
same time.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-vcarddav-webdav-mkcol-04.txt

Internet-Drafts are also available by anonymous FTP at:
(Continue reading)

Olivier GENDRIN | 10 Mar 10:50 2009

[foaf-dev] Comments in email adresses

Hi everyone !

I juste read an article [1] of Dominic Sayers about email adresses
validity according to relevant RFC.

I discover that email adresses can contain comments : "In other words
mail sent to first.last@... will go to the same place as
first(a).last(b) <at> example(c).com(d). Strange but true."

So perhaps we should spec in
http://xmlns.com/foaf/spec/#term_mbox_sha1sum that all comments should
be removed from the email adress before
sha1('mailto:valideemailadress').

[1] http://www.dominicsayers.com/isemail/

(have also a look at the email test cases :
http://code.iamcal.com/php/rfc822/tests.php)
Story Henry | 17 Mar 15:47 2009
Picon

Re: [foaf-dev] [foaf-protocols] FOAF Activity Streams


On 14 Mar 2009, at 12:25, Melvin Carvalho wrote:

> Enter your FOAF, and it will try and find your activity stream:
>
> Example: http://foaf.me/activity.php?uri=http://identi.ca/mhausenblas/foaf

This is really nice work! :-)

> There are a few more working examples on the page, beneath the input
> box.  It currently uses
>
> foaf:holdsAccount
> foaf:accountProfilePage

Even though I use accountProfilePage in my foaf, and blogged about it,  
I realised recently that this is not in the spec (yet?)

On 4 Febuary Simon Reihardt wrote on foaf-dev:
> Anyway, foaf:accountProfilePage seems to be what many people use  
> (including Henry Story: [4]). I still disagree with that because in  
> my eyes foaf:isPrimaryTopicOf [5] captures exactly what is needed  
> here. So if you really have to use yet another property just because  
> it's used in a context where foaf:isPrimaryTopicOf hasn't been used  
> before (but is perfectly valid for), then go ahead, but at least  
> make it a sub-property of foaf:isPrimaryTopicOf. In my eyes it's an  
> unnecessary duplication of properties. More re-use! Makes data  
> integration easier! :-)

So I am not myself sure what to do. But as you have found an  
(Continue reading)

Olivier GENDRIN | 17 Mar 18:20 2009
Picon

Re: [foaf-dev] [foaf-protocols] FOAF Activity Streams

On 14 Mar 2009, at 12:25, Melvin Carvalho wrote:
> Enter your FOAF, and it will try and find your activity stream:
>
> Example: http://foaf.me/activity.php?uri=http://identi.ca/mhausenblas/foaf

Why did you choose FOAF instead of SIOC (yes, it's also Identi.ca fault) ?

I'm not "friend" with all the people i'm following on identi.ca, some
of them are not even "people", but "agents" (like open source
projects). In the given example, I see that Mhausenblas is following
vocamp (3rd starting from the end), which is "a series of informal
events". Does FOAF allow me to be friend with a "a series of informal
events" ?

[1] http://identi.ca/vocamp

--

-- 
Olivier G.
http://twitter.com/lespacedunmatin
http://www.lespacedunmatin.info/blog/
Daniel O'Connor | 17 Mar 23:38 2009
Picon

Re: [foaf-dev] [foaf-protocols] FOAF Activity Streams


I'm not "friend" with all the people i'm following on identi.ca, some
of them are not even "people", but "agents" (like open source
projects). In the given example, I see that Mhausenblas is following
vocamp (3rd starting from the end), which is "a series of informal
events". Does FOAF allow me to be friend with a "a series of informal
events" ?

It doesn't allow you to be friends, it just states you foaf:know a foaf:agent.


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