Hi Dave, thanks a lot it works and I can see BestCategory as object property.
Now, myIndividual.getPropertyValue() also gets the value of Object property? Because I could not found something like myIndividual.getObjectPropertyValue() Again thank you. On Sat, Jan 14, 2017 at 10:00 PM, Sidra shah <[email protected]> wrote: > Yes you are right. I think the rule is Ok, Jena code is Ok but the problem > is in the ontology part i-e data property/object property. > > Let me choose BestCategory as object property and will make its domain > User class and range as class Category. > Category class have three members, that is catPhysics, catChemistry and > catGeography. > I will let you know the outcome. > > Thanks again Dave, > > Kind regards > > On Sat, Jan 14, 2017 at 9:29 PM, Dave Reynolds <[email protected]> > wrote: > >> On 14/01/17 18:22, Sidra shah wrote: >> >>> Thank you Dave for such a detailed reply. Actually you got my problem, >>> but >>> I have taken BestCategory as data property and the problem which bothered >>> me is I want the user BestCategory as a data or object property. >>> The main idea behind this is I want the value of this property for >>> further >>> processing. >>> For instance, I want if BestCategory==Physics >>> Then do something. >>> >>> Should I take BestCategory as Object property? Do you suggest it.? >>> >> >> In OWL a property can only be a DatatypeProperty or an ObjectProperty but >> not both. So you have to choose. >> >> In general in OWL modelling it is best to use symbols (i.e. URIs) for >> concepts like "Physics" and so BestCategory (or bestCategory) should be an >> ObjectProperty. >> >> You are completely free choose a different style and decide you will use >> strings and so make bestCategory an DatatypeProperty. >> >> Just be consistent in how you declare it and how you use it. >> >> And none of this has anything to do with Jena or with Jena rules! >> >> Dave >> >> >>> Kind regards >>> >>> On Sat, Jan 14, 2017 at 9:08 PM, Dave Reynolds < >>> [email protected]> >>> wrote: >>> >>> Hi Sidra, >>>> >>>> You have tried to explain your problem but the example is not minimal >>>> (it >>>> has elements in that aren't used) and isn't complete (no data, no >>>> minimal >>>> ontology, code doesn't generate any output or test any assertions) and >>>> it's >>>> not clear what your problem is. >>>> >>>> I'm not clear what you mean by "property not in the data property >>>> assertion but in the Annotations". I assume are referring to the >>>> Protege UI >>>> which in turn suggests that your ontology doesn't match your example >>>> code. >>>> If that's the case then you just need to fix your ontology - nothing to >>>> do >>>> with jena or jena rules or this list. >>>> >>>> In the interests of trying to explain for you and Neha what's needed >>>> then >>>> here's your code with some of the unnecessary bits removed and some >>>> output >>>> code added. I've also changed the name >>>> #BestCategory#Physics to #BestCategory_Physics because having a # >>>> character in your local name is really confusing. But I've not fixed >>>> any of >>>> the other style issues with the code or ontology names. >>>> >>>> >>>>>>> OntModel model >>>> = ModelFactory.createOntologyModel(OntModelSpec.OWL_DL_MEM); >>>> InputStream in = FileManager.get().open("data/test-ont.ttl"); >>>> model.read(in, "", "Turtle"); >>>> String ns="http://www.semanticweb.org/t/ontologies/2016/7/myOWL#";; >>>> OntProperty bestcat=model.getOntProperty(ns+ "BestCategory"); >>>> >>>> //Then rule >>>> String rule ="[rule1: ( ?x http://www.semanticweb.org/t/o >>>> ntologies/2016/7/myOWL#Physics_Preferred_Category ?cat1 )" + >>>> "( ?x http://www.semanticweb.org/t/o >>>> ntologies/2016/7/myOWL#Chem_Pr >>>> eferred_Category ?cat2 )" + >>>> "greaterThan(?cat1,?cat2)" + >>>> " -> (?x http://www.semanticweb.org/t/o >>>> ntologies/2016/7/myOWL#BestCategory http://www.semanticweb.org/t/o >>>> ntologies/2016/7/myOWL#BestCategory_Physics )]"; >>>> >>>> Reasoner reasoner2 = new GenericRuleReasoner(Rule.parseRules(rule)); >>>> InfModel infModel = ModelFactory.createInfModel(reasoner2, model); >>>> for (StmtIterator i = infModel.listStatements(null,b >>>> estcat,(RDFNode)null); >>>> i.hasNext();) { >>>> Statement s = i.next(); >>>> System.out.println( String.format("%s has best category %s", >>>> s.getSubject().getLocalName(), >>>> s.getObject().asResource().getLocalName()) ); >>>> } >>>> infModel.write(System.out, "Turtle"); >>>> <<< >>>> >>>> Now to run this we need an ontology but we only need to include those >>>> declarations used in the sample code (stripping out the bits your don't >>>> need is part of creating a minimal example). We also need test data to >>>> trigger the rule but for a minimal example, that might as well go in the >>>> ontology. So an example minimal "test-ont.ttl" file might be: >>>> >>>> >>>>>>> @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . >>>> @prefix owl: <http://www.w3.org/2002/07/owl#> . >>>> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . >>>> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . >>>> @prefix ex: <http://www.semanticweb.org/t/ontologies/2016/7/myOWL#> . >>>> >>>> ex:User a owl:Class . >>>> ex:BestCategory a owl:ObjectProperty . >>>> >>>> ex:Category a owl:Class . >>>> ex:BestCategory_Physics a ex:Category . >>>> >>>> ex:Physics_Preferred_Category a owl:DatatypeProperty . >>>> ex:Chem_Preferred_Category a owl:DatatypeProperty . >>>> >>>> ex:fred a ex:User; >>>> ex:Physics_Preferred_Category 3 ;minimal >>>> ex:Chem_Preferred_Category 1 . >>>> <<< >>>> >>>> That breaks lots of OWL naming conventions but at least it matches your >>>> code. >>>> >>>> If we run the sample code now then we see that rule fires correctly and >>>> outputs: >>>> >>>> fred has best category BestCategory_Physics >>>> >>>> and that the resulting complete model is displayed as >>>> >>>> >>>>>>> @prefix ex: <http://www.semanticweb.org/t/ >>>> ontologies/2016/7/myOWL#> . >>>> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . >>>> @prefix owl: <http://www.w3.org/2002/07/owl#> . >>>> @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . >>>> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . >>>> >>>> ex:fred a ex:User ; >>>> ex:BestCategory ex:BestCategory_Physics ; >>>> ex:Chem_Preferred_Category 1 ; >>>> ex:Physics_Preferred_Category 3 . >>>> >>>> ex:BestCategory a owl:ObjectProperty . >>>> >>>> ex:BestCategory_Physics >>>> a ex:Category . >>>> >>>> ex:Chem_Preferred_Category >>>> a owl:DatatypeProperty . >>>> >>>> ex:User a owl:Class . >>>> >>>> ex:Physics_Preferred_Category >>>> a owl:DatatypeProperty . >>>> >>>> ex:Category a owl:Class . >>>> >>>>> >>>>>>> >>>> That looks correct (or at least looks like it does what you say you are >>>> trying to do). If I load that into protege then I can see the individual >>>> fred and the ex:BestCategory property is shown as being a property >>>> assertion not an axiom. >>>> >>>> So on the face of it there is nothing wrong. >>>> >>>> Now if that's not enough to help you solve your problem then create a >>>> similarly complete minimal example which does show your problem. I >>>> expect >>>> your ontology will be a lot different from my example. However, for the >>>> sake of debugging your rule most of it won't be relevant so you should >>>> be >>>> able to cut it down to something of comparable size to the above, in >>>> which >>>> case it is then possible to post it inline in an email message for >>>> people >>>> to look at. If you do this please make sure it really is minimal and >>>> complete. Also for preference use Turtle (not RDF/XML) syntax because >>>> that >>>> is so much easier to read and more compact. >>>> >>>> Dave >>>> >>>> >>>> On 14/01/17 16:07, Sidra shah wrote: >>>> >>>> Hello All, I have a problem, very same to Neha. I was waiting some >>>>> answer >>>>> will come and I will get help but I think it did not solve. >>>>> I have quiz game for three categories(subjects) Physics, Chemistry and >>>>> Geography. User have to select one category and questions of that >>>>> category >>>>> will come. When user select a category Physics, for instance, 1 will >>>>> be >>>>> saved in a property Physics_Preferred_Category. When user select second >>>>> time Physics when login to the system, 2 will be saved. >>>>> I have designed a rule, shown below, to see which category user has >>>>> selected most of the time and will consider that BestCategory for that >>>>> user. The problem which I have currently is it saved the BestCategory >>>>> property not in the data property assertion but in the Annotations. >>>>> >>>>> I have tried to include possible code but not ontology. If it is >>>>> allowed I >>>>> will paste the screen shot of my properties. >>>>> >>>>> >>>>> OntModel model=ModelFactory.createOntologyModel(OntModelSpec.OWL_DL_M >>>>> EM); >>>>> InputStream in =FileManager.get().open("F://final.owl"); >>>>> if (in==null) { >>>>> throw new IllegalArgumentException( "File: " + " not >>>>> found"); >>>>> } model.read(in,""); >>>>> String ns="http://www.semanticweb.org >>>>> /t/ontologies/2016/7/myOWL#"; >>>>> OntClass dil = model.getOntClass(ns + "DiligentUser"); >>>>> OntClass avgr = model.getOntClass(ns + "AverageUser"); >>>>> OntProperty bestcat=model.getOntProperty(ns+ "BestCategory"); >>>>> Individual indiv = user1.createIndividual(ns + name); //name comes >>>>> from a >>>>> text field >>>>> //Then rule >>>>> >>>>> String rule ="[rule1: ( ?x http://www.semanticweb.org/t/ >>>>> ontologies/2016/7/myOWL#Physics_Preferred_Category ?cat1 )" + >>>>> "( ?x http://www.semanticweb.org/t/ontologies/2016/7/myOWL#Chem_ >>>>> Preferred_Category ?cat2 )" + >>>>> // "( ?x http://www.semanticweb.org/t/o >>>>> ntologies/2016/7/myOWL#Geo_ >>>>> Preferred_Category ?cat3 )" + >>>>> // "greaterThan(?cat1,?cat2), greaterThan(?cat1,?cat3)" >>>>> + " -> (?x http://www.semanticweb.org/t/o >>>>> ntologies/2016/7/myOWL# >>>>> BestCategory http://www.semanticweb.org/t/ontologies/2016/7/myOWL# >>>>> BestCategory#Physics )]"; >>>>> >>>>> //in ?cat1, ?cat2 ?cat3 there will be numbers like 1 2 3 >>>>> >>>>> Reasoner reasoner2 = new GenericRuleReasoner(Rule.parseRules(rule)); >>>>> InfModel infModel = ModelFactory.createInfModel(reasoner2, >>>>> model); >>>>> >>>>> infModel.listStatements(null,bestcat,(RDFNode)null); >>>>> } >>>>> >>>>> >>>>> >>>> >>> >> >
