- From: Golda Velez <gv@btucson.com>
- Date: Tue, 4 Mar 2008 11:06:44 -0700
- To: Cristiano Longo <cristiano_longo@yahoo.it>
- Cc: semantic-web@w3.org
Hello Cristiano, all - I have question in this area What about statements about assertions other than who is the asserter? It seems to me that the QUADS you mean, only include an extra field of ID for a statement in order to address the statement itself? It seems to me that it is important to be able to address a statement for many purposes, and that adding an asserter field as a property does not give the same functionality. With a statement address I can make any assertion about the original statement, which is much more flexible than only adding an asserter. If we take this example again s1 p1 01 s2 p2 o2 but add naming, maybe I use the wrong convention but say n1: s1 p1 01 n2: s2 p2 o2 now as a third person I can add the assertion n3: n1 p3 o4 which might have such predicate as p3 = 'ex:agrees_with_based_on' and o4 some basis for agreement (or disagreement). It seems to me this ability to talk about statements is really fundamental to any meaningful discussion/ building of knowledge other than rigid already-perfectly-agreed on facts, which are fewer than one might at first imagine. Also, is it possible to construct a named graph in RDFa by simply adding an id= property to the tag? I will send a separate email about this subject... thanks --Golda On Tuesday 04 March 2008 8:21, Cristiano Longo wrote: > > Thanks all. > > Let me summarize. There is too main trends. > The first(Phil Archer, Story Henry) suggests to keep > track of a "graph" and record graph provenance. If I > understood good, it means to use QUADS or to put into > my knowledge base only graph uri and graph provenance. > > The second trend is to store assertions into rdf using > something like realization, creating for example an > individual assertion with an asserter and some > property > filled with the assertion. > > I noticed that Evaluation and Report Language, > Semantic Web Publishing Vocabulary(WIQA) and Ratings > Ontology follows this second trend(probably also Proof > Markup Language), providing properties to specify the > asserter of something(e.g. in EARL an agent assert > that a document passed or not a checkpoint). > > So i think that probably(if not exists), for > interoperability purposes, we need to formalize these > situations into a main specification(or extending a > suitable one), preferably grounding it with > description logics. > > Thank you and sorry for my english, > Cristiano Longo > > --- Chris Bizer <chris@bizer.de> ha scritto: > > > Hi Cristiano, > > > > as Steffen already said, using the Named Graph data > > model together with > > SPARQL is a practical and well tested way for doing > > this. > > > > Reification is considered dead by most people > > working on Semantic Web-based > > data integration. I think the only people still > > thinking about using > > reification are the new OWL working group and I hope > > that they will also > > realize at some point that they are running into > > problems with this. > > > > If you need a vocabulary for representing > > meta-information about graphs, one > > option is to use the Semantic Web Publishing > > vocabulary. A framework that > > might be interesting for you with regards to trust > > is the WIQA Web > > Information Quality Assessment framework, which > > employs the Named Graphs > > data model and allows you to formulate various > > information filtering > > policies using a policy language that is based on > > SPARQL. > > > > See: > > > > http://www4.wiwiss.fu-berlin.de/bizer/WIQA/index.htm > > > http://www4.wiwiss.fu-berlin.de/bizer/WIQA/browser/index.htm > > > > Cheers > > > > Chris > > > > > > -- > > Chris Bizer > > Freie Universität Berlin > > +49 30 838 54057 > > chris@bizer.de > > www.bizer.de > > ----- Original Message ----- > > From: "Steffen Staab" <staab@uni-koblenz.de> > > To: "Cristiano Longo" <cristiano_longo@yahoo.it> > > Cc: <semantic-web@w3.org> > > Sent: Tuesday, March 04, 2008 9:13 AM > > Subject: Re: meta-information about assertions > > > > > > > Hi, > > > > > > here is a WWW08 paper about this: > > > > > > http://www.uni-koblenz.de/~staab/Research/Publications/2008/WWW2008-MetaKnowledge.pdf > > > and here is its implementation: > > > > > > http://www.uni-koblenz.de/FB4/Institutes/IFI/AGStaab/Research/MetaKnowledge > > > > > > Cheers, > > > Steffen > > > > > > Cristiano Longo schrieb: > > >> Hi all, > > >> i'm trying to merge rdf(more specifically OWL) > > graphs > > >> from different sources using collaborative > > filtering > > >> and trust related technologies. But my question > > is: > > >> what is the proper way to encode a "meta > > assertion" > > >> like "A says X about B", in order to deal with > > >> contraddictory assertions? > > >> > > >> Reification? Using SKOS? Something else? > > >> > > >> Thank you in advance. > > >> > > >> > > >> ___________________________________ > > >> L'email della prossima generazione? Puoi averla > > con la nuova Yahoo! Mail: > > >> http://it.docs.yahoo.com/nowyoucan.html > > >> > > >> > > >> > > > > > > > > > > > ___________________________________ > L'email della prossima generazione? Puoi averla con la nuova Yahoo! Mail: http://it.docs.yahoo.com/nowyoucan.html > -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Golda Velez 520-440-1420 http://goldavelez.com what I do: Tucson Superblog http://btucson.com Search software http://webglimpse.net Web hosting http://iwhome.com "Help organize the world - index your own corner of the web!"
Received on Tuesday, 4 March 2008 17:57:39 UTC