ontology

问题 Ontology files usually have extensions such as .owl or .rdf. I want to know when I should open ontologies with 'turtle' and when with 'xml' or other formats? Because it seems that each of them is useful for a type of format and unfortunately, it seems that people sometimes save files with the wrong extension. Here is a sample code in Python (but java is not very different either): g.parse('ontology.owl', format='turtle') So, how do I know here the turtle is the correct format? Thanks in

问题 I'm using Protege to develop an ontology that will include some things that are already described in DBpedia. Let's say I want to include a class 'Cities' and have 'Berlin' as an individual. My Berlin will have some properties the DBpedia Berlin doesn't but otherwise I'd like to 'reuse' DBpedia's Berlin. Do I need to define my own Berlin and then use rdf:seeAlso or can I somehow import DBpedia's Berlin and add some properties? 回答1: Just use the DBpedia IRI, If it's sufficient to simply talk

问题 Im trying to get the data in a more readable format when using a SPARQL query with Jena, however I have no idea how to extract the data in a proper way. As for now, the output is: "http://www.w3.org/TR/2003/PR-owl-guide-20031209/wine#SaucelitoCanyon" Where instead would like to just have the "SaucelitoCanyon" as a output. public JenaQuery() { String wineRegion = "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>\n" + "PREFIX owl: <http://www.w3.org/2002/07/owl#>\n" + "PREFIX xsd:

问题 I'm looking for a solution in order to "remove" the inference during a query launched on Sesame. I must use a "Native Java Store RDF Schema" repository and I have this query : I have an instance, a NamedIndividual, and I want the uri of the class whose instance it is : SELECT DISTINCT ?uri WHERE { <http://www.semanticweb.org/ontotest#myInstance> rdf:type ?uri . FILTER (?uri rdf:type owl:Class) } The problem is that I get severals URI (whom the good URI) instead of one because of the inference

问题 This is my query: PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX rs: <http://www.welovethesemanticweb.com/rs#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> construct { ?subject0 rs:similarityValue ?similairty0. ?subject1 rs:similarityValue ?similairty1 } WHERE { { ?subject0 ?predicate0 ?object0. rs:Impromptu_No._1 ?predicate0 ?object0. ?predicate0 rs:hasSimilarityValue ?similairty0Helper. BIND(?similairty0Helper * (4/9) AS ?similairty0) FILTER (?subject0 != rs

问题 This is my ontology created with protege 5 . If i make cl1 and cl2 disjoint, then the ontology is being inconsistent , but if i uncheck is_friend_of reflexive , the ontology is not inconsistent any more . whats wrong with my ontology ? I want only cl1 class individuals have is_friend_of property. 回答1: Reflexivity of :is_friend_of is essential for inconsistency. Take a look at Reasoner > Inconsistent ontology explanation : I'll try to translate this explanation into (poor) English: Since :is

问题 I used OWL API to merge 2 owl files correctly. However I discovered that classes/entities withe the same name(Joshua helped to define it this way: prefixes defined such that the suffix of the classes' IRIs equal under a case insensitive string comparison) are repeated. I need to output these classes with the same names as one. any help will be appreciated. thank you in advance. 来源： https://stackoverflow.com/questions/19515464/merge-equivalent-classes-using-owl-api

问题 What is the meaning of an owl:hasValue restriction, and how is it different from owl:allValuesFrom and owl:someValuesFrom ? In an ontology, I want to write an axiom that says, “Every body that has a diploma is literate.” How can I write this? 回答1: Different types of restriction classes Consider an individual x, a class C, a property P, and another individual y. Then there are a few class expressions that it sounds like you're concerned with: someValuesFrom An individual x is an element of the

问题 Is there a way to get the base namespace from a OWL ontology file, without using DOM or similar, but just using Jena's API? E.g., from an OWL file: <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:protege="http://protege.stanford.edu/plugins/owl/protege#" xmlns="http://www.owl-ontologies.com/Ontology1254827934.owl#" xmlns:xsp="http://www.owl-ontologies.com/2005/08/07/xsp.owl#" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" xmlns

问题 In this document https://www.w3.org/TR/rdf-schema/#ch_introduction it is written: rdfs:Resource is an instance of rdfs:Class. however it is also written: This is the class of everything is this a typo? can a class be an instance ? 回答1: That's actually an interesting question. I just want to add to your comment in CaptSolo's answer: but can I define my custom classes as instances of an instance? ( i highly doubt that ) It's not so much a question of whether you "can" do something or not (at