Hi Scott,
I think I have spotted a typo in the SPARQL specifiction of OWL-RL. The
typo, if it is, exists in my version of TBC-ME, which is a later version of
3.4.
The following rule contains the typo. The second occurance of '?u ?p ?y1'
should read: ' ?u ?p ?y2'.....
Unless I am mistaken, if so, I am confused by this rule.
See Below.
Best,
Leonard
# cls-maxqc3
CONSTRUCT {
?y1 owl:sameAs ?y2 .
}
WHERE {
?x owl:maxQualifiedCardinality "1"^^xsd:nonNegativeInteger .
?x owl:onProperty ?p .
?x owl:onClass ?c .
?u a ?x .
?u ?p ?y1 .
?y1 a ?c .
?u ?p ?y1 .
?y2 a ?c .
}
On Sat, Jul 16, 2011 at 1:31 PM, Scott Henninger <[email protected]
> wrote:
> On 7/15/11 3:30 PM, Leonard Jacuzzo wrote:
> > Scott,
> > Thanks this is great. What I meant was, I want to apply my understanding
> of OWL Semantics using SPIN...Not the model that is machine
> interpretable...I basically want OWL inferencing but faster and in a more
> choice driven manner so I want to capture OWL semantics with SPIN rules.
> >
>
> Yes, the OWL 2 RL is designed specifically for scalable reasoning. In
> addition, the SPARQL implementation of OWL2RL in Composer/TopBraid
> Suite has the flexibility you desire, as rules can chosen as desired.
> All rules are defined as templates as defined in TopBraid/SPIN/
> owlrl.spin.rdf. There are two ways to customize these rules:
>
> 1. Start with an empty SPIN model (New > RDF/OWL SPIN File). Open
> OWL:Thing (if you want to apply inferences to all classes in the
> model) and choose "Create from SPIN Template" from the spin:rule
> context menu. This template wizard will display a list of templates
> that include all of the owlrl rules. Choose the rules you want to
> apply to the model. You need to do this for each rule, so if you want
> most of the rules, use method 2.
>
> 2. Copy TopBraid/SPIN/owlrl-all.rdf to some project in your
> workspace. Open it, modify its base URI, and save ( a very important
> step). Open owl:Thing. A list of all rules will appear in the
> rules. By default only the 50 properties are shown on the form (the
> spin:rule property will say "(incomplete)"), but you can change this
> through the preferences (Preferences > TopBraid Composer, change the
> value of 'Max number of values on forms').
>
> I'd start by removing some of the computationally useless rules, such
> as eq-ref (no pragmatic rule system can start with a guarantee that
> the number of triples are tripled - this rule is simply senseless) and
> scm-cls (although you may want to introduce a rule that ensures that
> an owl:Class definition is a subClassOf owl:Thing).
>
> In either case, when finished import the rule file to your model and
> set the inference engine to TopSPIN. If you had previously set the
> Profile to OWL2RL, undo that so you just run your rule sub-set.
>
> Not sure why TopSPIN would hang on a OWL2RL rule. If it's the case,
> we'd like to hear more about this, including what actions you took,
> what behavior you observed, and any errors and warnings in the log
> that may be clues. Of course the version number and OS is always key
> to help us help you.
>
>
> On Jul 15, 3:46 pm, Leonard Jacuzzo <[email protected]> wrote:
> > Hi Scott,
> > cls-svf1 is not what I am after.
> >
> > Compare
> >
> > # cls-svf1
> > CONSTRUCT {
> > ?u a ?x .}
> >
> > WHERE {
> > ?x owl:someValuesFrom ?y .
> > ?x owl:onProperty ?p .
> > ?u ?p ?v .
> > ?v a ?y .
> >
> > }
> > To what I wrote:
> > > CONSTRUCT {?this rdfs:subClassOf ?restriction .
> > > ?restriction rdf:type owl:Restriction .
> > > ?restriction owl:onProperty :isPartOf .
> > > ?restriction owl:someValuesFrom ?Var . }
> >
> > > WHERE {
> >
> > > ?var rdfs:subClassOf ?restriction1 .
> > > ?restriction1 rdf:type owl:Restriction .
> > > ?restriction1 owl:onProperty :hasPart .
> > > ?restriction1 owl:someValuesFrom ?this .
> > > }
> >
> > What I want to do is to create a restriction on one property from a
> > restriction on another. In this case I started with 'haspart' being
> > restricted to WHEEL and end up with isPart being restricted to auto.
> Where
> > Wheel is a subclass of the latter restriction and Auto is a subclass of
> the
> > former restriction.
> >
> > Maybe I can explain it better with some thought.
> >
> > Thanks again, I am having fun.
> > LFJ
> > On Fri, Jul 15, 2011 at 4:23 PM, Scott Henninger <
> [email protected]
> >
> > > wrote:
> > > See comments inline:
> >
> > > > Hi Scott,
> > > > Thanks for this. It did not work for me. How is your inferencing
> > > configured?
> >
> > > I have TopSPIN configured for inferencing. What didn't work? The
> > > queries do use some SPARQL 1.1 features that may not be in earlier
> > > versions of TBC. Upgrading to 3.5.x will work, as will replacing IF
> > > with smf:if and COALESCE with smf:firstBound.
> >
> > > > Also, your rule seems to be constructing a restriction. How does the
> > > inferencing work such that an individual is classified as a teenager?
> Does
> > > the reasoner construct the restriction and then determine that Since
> the
> > > individual is a person, and a member of the restriction class, and
> teenager
> > > is the intersection of Person and The Restriction, the individul is
> > > therefore a teenager?
> >
> > > A restriction creates an unnamed node (bnode) that represents a
> > > class. In the case of an equivalentClass restriction on a class, the
> > > restriction is an equivalentClass meaning that all members of the
> > > restriction are also members of the class. E.g. suppose we have:
> > > :Teenager a owl:Class .
> > > <restr> owl:equivalentClass :Teenager
> >
> > > The restriction, such as "Person and (hasAge only xsd:integer[>= 13 ,
> > > <= 19])" is applied to the class defined by the restriction. Since it
> > > is an equivalent class with :Teenager, then all members of the
> > > restriction are members of :Teenager, and vice-versa.
> >
> > > > I am trying to get a handle on how SPIN works to perform inferences
> based
> > > on OWL semantics. Maybe a more general rule would be better.
> >
> > > On its own, it doesn't. SPIN is a different way to accomplish
> > > inferences. It is based on SPARQL, and as such has no inherent
> > > interactions with OWL (it is rdf-based). However, one of the OWL 2
> > > profiles, OWL 2 RL, is defined such that a triple-based rule engine
> > > can implement it directly. SPARQL, using CONSTRUCT, is one such
> > > engine. When you choose OWL2 RL in the Ontology Home Profile, a set
> > > of rules implementing OWL 2RL profile are applied when you run
> > > inferences.
> >
> > > In effect, this imports TopBraid/SPIN/owlrl-all.rdf. For a listing of
> > > these rules, seehttp://topbraid.org/spin/owlrl-all.html. Compare
> > > these to the standard,
> > >http://www.w3.org/TR/owl2-profiles/#Reasoning_in_OWL_2_RL_and_RDF_Gra.
> ..
> > > ,
> > > and you'll see this is a direct implementation the profile.
> >
> > > So, as a simpler example, see the cas-sco rule:
> >
> > > CONSTRUCT { ?x a ?c2 .}
> > > WHERE {
> > > ?c1 rdfs:subClassOf ?c2 .
> > > ?x a ?c1 .
> > > }
> >
> > > This is the classic subclassOf inference. If ?x is a member of ?c1
> > > and ?c1 is a subClassOf ?c2, then ?x is a member of ?c2.
> >
> > > > So instead of classifying an individual, I tried to do some class
> level
> > > reasoning. For example, If I have a class such as Automobile and it is
> > > defined as a subclass of the restriction on 'Haspart' to some value
> wheel,
> > > how would a rule that resulted in "wheel isPartOF some Automobile.
> >
> > > > So I want to go from
> >
> > > > Auto :subClassOf {hasPart some Wheel}
> >
> > > > To
> >
> > > > Wheel :subClassOf {isPartOf some Automobile}
> >
> > > someValuesOf restrictions on someValesOf are already included in OWL 2
> > > RL, so you don't need to re-implement them. See cls-svf1 and cls-
> > > svf2.
> >
> > > -- Scott
> >
> > > > My attempt was the following, but I could not get it to work when
> > > attached to thing, or even the class that I created to test it. Does
> one use
> > > '?this' to refer to a class? Maybe if I understand this easy one, It
> will
> > > help with the more difficult rules.
> >
> > > > CONSTRUCT {?this rdfs:subClassOf ?restriction .
> > > > ?restriction rdf:type owl:Restriction .
> > > > ?restriction owl:onProperty :isPartOf .
> > > > ?restriction owl:someValuesFrom ?Var . }
> >
> > > > WHERE {
> >
> > > > ?var rdfs:subClassOf ?restriction1 .
> > > > ?restriction1 rdf:type owl:Restriction .
> > > > ?restriction1 owl:onProperty :hasPart .
> > > > ?restriction1 owl:someValuesFrom ?this .
> > > > }
> >
> > > > On Thu, Jul 14, 2011 at 2:03 PM, Scott Henninger <
> > > [email protected]> wrote:
> >
> > > > Leonard; Attached is an example SPIN rule that is generalized to
> > > address all datarange restrictions - one or two data range values and
> all
> > > four datarange restrictions. There are some test cases included so you
> can
> > > run inferences and experiment with this. This is just a draft, so see
> how
> > > it works for you.
> >
> > > > The main part of the example is the rule on the :Person class:
> >
> > > > CONSTRUCT {
> > > > ?this a ?restriction .
> > > > }
> > > > WHERE {
> > > > ?datatype owl:onDatatype xsd:integer .
> > > > ?datatype owl:withRestrictions ?restrList .
> > > > ?datatype a rdfs:Datatype .
> > > > ?restriction ?restrType ?datatype .
> >
> > > > ?restriction a owl:Restriction .
> > > > ?restriction owl:onProperty ?datatypeproperty .
> > > > ?this ?datatypeproperty ?val .
> > > > ?restrList rdf:rest ?restrListRest .
> > > > BIND (IF((?restrListRest = rdf:nil), :singleDataRange(?val,
> > > ?restrList), :doubleDataRange(?val, ?restrList)) AS ?boolResult) .
> > > > FILTER (?boolResult) .
> > > > }
> >
> > > > The {?restrList rdf:rest ?restrListRest .} gets the restriction
> list.
> > > If ?restrListRest = rdf:nil, then there is only one data range to
> consider.
> > > Otherwise there are two. The BIND statement uses this fact to call
> > > functions that compute whether the range restriction is met. You can
> find
> > > the definitions for these functions by doing a ctl-click in the
> spin:rule
> > > for :Person.
> >
> > > > The datarange definitions for three classes are included to test
> this
> > > out. The instances of :Person will be classified by rules (the two
> values
> > > for :Scott are both lies ;-) but it classifies correctly)
> >
> > > > :Child owl:equivalentClass "Person and (hasAge only
> xsd:integer[<=
> > > 12])"
> > > > :Teenager owl:equivalentClass "Person and (hasAge only
> xsd:integer[>=
> > > 13 , <= 19])"
> > > > :Adult owl:equivalentClass "Person and (hasAge only xsd:integer[>
> > > 19])"
> >
> > > > -- Scott
> >
> > > > On 7/13/11 9:09 AM, Leonard Jacuzzo wrote:
> > > >> Hello Topquadrant folks.
> >
> > > >> I have been pulling my hair out in an attempt to construct a
> SPIN
> > > rule that is general enough to classify an instance for any datarange
> > > restriction using maxInclusive and MinInclusive.
> >
> > > >> Going back to the running example. I have defined teenager as
> being
> > > equivalent to the intersection of (Person, and hasAge only mininclusive
> 13,
> > > and hasAge only maxinclusive 19).
> >
> > > >> I would like to have a person classified as being a
> teenager...But I
> > > would like to have a general rule to do any classification of this
> nature
> > > and attach it to Thing. Below is what I have come up with so far.
> > > >> TBC rejects it based on syntax. Can anyone spot the problem(s)?
> I
> > > feel like I am chasing my tail.
> >
> > > >> Here is what I have so far.
> >
> > > >> CONSTRUCT {?this a ?P}
> >
> > > >> WHERE {?this a ?B.
> >
> > > >> ?P rdfs:subclassOf ?B.
> >
> > > >> ?P owl:equivalentClass ?A.
> > > >> ?A owl:intersectionOf ?B, ?restriction, ?restriction2
> > > >> ?datatype owl:onDatatype xsd:float .
> > > >> ?datatype owl:withRestrictions ?var .
> > > >> ?datatype a rdfs:Datatype .
> > > >> ?restriction owl:allValuesFrom ?datatype .
> > > >> ?restriction a owl:Restriction .
> > > >> ?restriction owl:onProperty ?datatypeproperty .
> > > >> ?var rdf:first ?var1 .
> > > >> ?var1 xsd:minInclusive ?mval .
> > > >> ?x2 ?datatypeproperty ?val .
> > > >> ?datatype2 owl:onDatatype xsd:float .
> > > >> ?datatype2 owl:withRestrictions ?var .
> > > >> ?datatype2 a rdfs:Datatype .
> > > >> ?restriction2 owl:allValuesFrom ?datatype .
> > > >> ?restriction2 a owl:Restriction .
> > > >> ?restriction2 owl:onProperty ?datatypeproperty .
> > > >> ?var2 rdf:rest ?var3 .
> > > >> ?var3 xsd:maxInclusive ?maval .
> > > >> ?x2 ?datatypeproperty ?val2 .
> > > >> FILTER (?val >= ?mval) .
> > > >> FILTER (?val2 <= ?maval). }
> > > >> --
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