W3C home > Mailing lists > Public > public-rdf-wg@w3.org > August 2012

Re: RDF-ISSUE-90 (LV-entailment): Define a simple form of “literal value entailment” [RDF Semantics]

From: Pat Hayes <phayes@ihmc.us>
Date: Tue, 14 Aug 2012 10:48:22 -0500
Cc: public-rdf-wg@w3.org
Message-Id: <5EE5CFE0-C270-4583-95EB-70B51E5E07DB@ihmc.us>
To: Antoine Zimmermann <antoine.zimmermann@emse.fr>

On Aug 14, 2012, at 4:19 AM, Antoine Zimmermann wrote:

> One more clarification: I've integrated something that Pat suggested several times already, namely that the interpretation is independent of a vocabulary V. Otherwise,

Might be safest to keep things conventional for now. So...

> the definition can be rephrased as:
> 
> """
> Let D be a datatype map. We define an LV-interpretation(D) of a vocabulary V (or, LV-interpretation with respect to D of a vocabulary V) as a simple interpretation I of V which satisfies the following conditions:
> 
> *LV semantic conditions.*
> - if <aaa,x> is in D then for any typed literal "sss"^^ddd in V with I(ddd) = x,
>  * if sss is in the lexical space of x then IL("sss"^^ddd) = L2V(x)(sss),
>  * otherwise IL("sss"^^ddd) is not in LV
> """

Right, that seems to make sense. D-entailment without the RDFS part built in. 

This means that ill-formed literals are equivalent only if they are lexically identical, otherwise literals can be substituted for others with the same value (even if they use a different datatype, at least in principle. If the datatypes define values so that distinct type value spaces are always disjoint, then this case doesn't arise, of course.)

Pat



> 
> 
> AZ
> 
> Le 14/08/2012 11:14, Antoine Zimmermann a écrit :
>> Clarification: an rdf-interpretation would be a LV-interpretation wrt
>> the datatype map that contains rdf:XMLLiteral, xsd:string and rdf:HTML.
>> But it would not be *simply* that.
>> 
>> Here is a proposal for the semantics of LV-entailment:
>> 
>> [...We have to assume that datatypes and datatype maps have been
>> formally introduced before...]
>> 
>> """
>> Let D be a datatype map. We define an LV-interpretation(D) (or,
>> LV-interpretation with respect to D) as a simple interpretation I which
>> satisfies the following conditions:
>> 
>> *LV semantic conditions.*
>> - if <aaa,x> is in D then for any typed literal "sss"^^ddd with I(ddd) = x,
>> * if sss is in the lexical space of x then IL("sss"^^ddd) = L2V(x)(sss),
>> * otherwise IL("sss"^^ddd) is not in LV
>> """
>> 
>> Can Pat check if this is correct and sufficient?
>> 
>> 
>> 
>> AZ
>> 
>> Le 14/08/2012 10:54, Antoine Zimmermann a écrit :
>>> 
>>> 
>>> Le 21/05/2012 16:08, RDF Working Group Issue Tracker a écrit :
>>>> RDF-ISSUE-90 (LV-entailment): Define a simple form of “literal value
>>>> entailment” [RDF Semantics]
>>>> 
>>>> http://www.w3.org/2011/rdf-wg/track/issues/90
>>>> 
>>>> Raised by: Richard Cyganiak
>>>> On product: RDF Semantics
>>>> 
>>>> Define a simple form of graph equivalence that is like graph
>>>> isomorphism, but allows substitution of literals by equal-valued other
>>>> lexical forms. This would help with test cases and the like. It could
>>>> be defined as a form of entailment (LV-Entailment, a small extension
>>>> to Simple Entailment) or as an extension to graph isomorphism.
>>>> 
>>>> (Would the old RDF-Entailment then simply be LV-Entailment over a
>>>> datatype map that contains only rdf:XMLLiteral?)
>>> 
>>> 
>>> No because an rdf-interpretation also has:
>>> 
>>> "x is in IP if and only if <x, I(rdf:Property)> is in IEXT(I(rdf:type))"
>>> 
>>> 
>>> 
>> 
> 
> -- 
> Antoine Zimmermann
> ISCOD / LSTI - Institut Henri Fayol
> École Nationale Supérieure des Mines de Saint-Étienne
> 158 cours Fauriel
> 42023 Saint-Étienne Cedex 2
> France
> Tél:+33(0)4 77 42 66 03
> Fax:+33(0)4 77 42 66 66
> http://zimmer.aprilfoolsreview.com/
> 
> 

------------------------------------------------------------
IHMC                                     (850)434 8903 or (650)494 3973   
40 South Alcaniz St.           (850)202 4416   office
Pensacola                            (850)202 4440   fax
FL 32502                              (850)291 0667   mobile
phayesAT-SIGNihmc.us       http://www.ihmc.us/users/phayes
Received on Tuesday, 14 August 2012 15:49:02 UTC

This archive was generated by hypermail 2.3.1 : Tuesday, 6 January 2015 22:02:06 UTC