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last updated at 2004-02-05 22:59
An OWL question re FOAF spec
danbri: For FOAF, we'd like to say formally, "If some thing is a foaf:PersonalProfileDocument, then any thing that is foaf:maker of it, will also be foaf:primaryTopic of it." (and vice versa)
mortenf: It seems OWL may not be sufficient, as allValuesFrom and someValuesFrom are too loose, and hasValue is too tight
mortenf: ... but foaf:MortensProfileDocument could be defined with hasValue (like the foaf:Group contructs)
DanC: let's see... in N3: this log:forAll :D. { :D a foaf:PersonalProfileDocument } <=> { this log:forAll :WHO. { :D foaf:maker :WHO } <=> { :D foaf:primaryTopic :WHO } }.
DanC: I think you can do about 2/3rds of those implications in OWL, but not all of them.
DanC: using cardinalities.
Jhendler: xxx
Jhendler: this is similar to the "mother-in-law" v. "uncle" issue -- if these things are functional, it's decidable and expressible - if not, it isn't
Jhendler: without a workaround -- SWRL (or cwm) can do it
 
danbri: see also rdfweb-dev thread.
 
DanC: have the open source browsers picked this up yet?
DanC: I gather mozilla bug 120398 isn't fixed yet
mortenf: very interesting indeed, and standards based too!
 
 
 
Wack: GraphPath is a little-language for analysing graph-structured data, especially RDF. The syntax of GraphPath is reminiscent of Xpath. It has a python implementation that can be teamed up with your favourite python RDF API (e.g. Redland, rdflib, or your own API).
Wack: Was not chumped before, and I happened to come across this, why did I not find this before?! :]
Wack: Uses operator overloading abilities of Python to 'create' path expressions and rules, very smart (although many people abhorr operator overloading for such 'trivial' things).
 
libby: an online version of ical2rdf.pl
libby: see also RDFiCal-a-matic, which generates RDFiCal events form a webform
 
mdupont: It looks like such a project might well benefit from using rdf for a markup language.
 
 
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