- From: Axel Polleres <axel.polleres@deri.org>
- Date: Fri, 19 Feb 2010 21:10:19 +0000
- To: Dave Reynolds <dave.e.reynolds@googlemail.com>, RIF <public-rif-wg@w3.org>
- Cc: Axel Polleres <axel.polleres@deri.org>
(re-send) sorry, had the old address of dave still in my address book...
On 19 Feb 2010, at 14:50, Axel Polleres wrote:
> p.s.: Likewise this applies to the rule templates for allDiscjointClasses and allDisjointProperties
>
> Axel
>
> On 19 Feb 2010, at 14:46, Axel Polleres wrote:
>
>> Hi all,
>>
>> I just realise that my formerly proposed correction for (* eq-diff2 *) also needs to be carried over to the appendix of
>> http://www.w3.org/2005/rules/wiki/OWLRL
>>
>> cf. http://www.w3.org/2005/rules/wiki/OWLRL#Appendix:_OWL_2_RL_to_RIF_translation
>>
>> the template rule for
>>
>> (?a rdf:type owl:AllDifferent)
>> (?a owl:members ?l)
>>
>> in Section 7.2 templateRules algorithm has the same problem that and needs to be changed likewise!
>>
>> cheers,
>> Axel
>>
>> On 15 Sep 2009, at 09:34, Axel Polleres wrote:
>>
>>> Sorry, I had completely delayed this... here my first few comments (upto end of section 4.3), the rest to follow shortly...
>>>
>>>
>>>
>>> 1)
>>> the suggestion of rif:error as a unary predicate is a good idea, but conflicts with the use of rif:error as a 0-ary prediacte in the RDF-OWL-compatibility document [1]
>>>
>>> 2)
>>> I am afraid there is a problem with rule (* eq-diff2 *)... It does not prevent that ?x and ?y bind to the SAME member of the list, where no inconsitency should apply... the solution is to extend the memeber predicate with an index. and let the rule apply to differently indexed members only, i.e. :
>>>
>>>
>>> Group (
>>> Forall ?list ?hd (
>>> _member(?list ?hd 0 ) :- ?list[rdf:first -> ?hd] )
>>>
>>> Forall ?list ?tl ?x (
>>> _member( ?list ?x External( func:numeric-add( ?i+1 ) ) ) :- And( ?list[rdf:rest -> ?tl] _member(?tl ?x ?i) ) )
>>> )
>>>
>>> then (* eq-diff2 *) can be rewritten to:
>>>
>>> Forall ?x ?y ?l (
>>> rif:error("AllDifferent") :- And (
>>> ?l[rdf:type -> owl:AllDifferent]
>>> _member(?l ?x ?i) _member(?l ?y ?j)
>>> External( pred:numeric-not-equal ( ?i ?j ) )
>>> ?x[owl:sameAs->?y] ) )
>>>
>>> And analogously for (* prp-adp *) and (* cax-adc *)
>>>
>>>
>>>
>>> 3)
>>> Haskey --> HasKey
>>>
>>>
>>>
>>>
>>>
>>>
>>> 1. http://www.w3.org/TR/rif-rdf-owl/#Appendix:_Embeddings_.28Informative.29
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Dr. Axel Polleres
>>> Digital Enterprise Research Institute, National University of Ireland, Galway
>>> email: axel.polleres@deri.org url: http://www.polleres.net/
>>>
>>>
>>>
>>
>
>
Received on Friday, 19 February 2010 21:10:55 UTC