owl

问题 I am an rdflib beginner, i have an ontology with classes and sub-classes and I need to look for a specific word in a subclass and, if it is found, return its class name. I have the following code: import rdflib from rdflib import plugin from rdflib.graph import Graph g = Graph() g.parse("test.owl") from rdflib.namespace import Namespace plugin.register( 'sparql', rdflib.query.Processor, 'rdfextras.sparql.processor', 'Processor') plugin.register( 'sparql', rdflib.query.Result, 'rdfextras

问题 I have 2 properties, e.g. 'hasColor' and 'hasFinish'. I want to express with ontology that in case of ontology class A are properties 'hasColor' and 'hasFinish' equal (owl:equivalentProperty). But in case of ontology class B the properties 'hasColor' and 'hasFinish' are NOT equal. How can I achieve this? One way probably is to create 'hasColor' and 'hasFinish' properties with class A as a range and set them to be equal. Then create another ones 'hasColor' and 'hasFinish' properties with class

问题 I have an OWL 2 ontology containing several named individuals belonging to a class that need to have the same object property with the same value. I would like to make this property assertion "on the class" in such a way that a reasoner could infer the property to be had by all of its members, thus without needing an explicit assertion for each. (obtaining something similar to a class-based object-oriented property inheritance) A simple example could be an ontology containing the individuals

问题 I am trying to execute following code. import java.io.File; import org.semanticweb.owlapi.apibinding.OWLManager; import org.semanticweb.owlapi.model.AddAxiom; import org.semanticweb.owlapi.model.IRI; import org.semanticweb.owlapi.model.OWLAxiom; import org.semanticweb.owlapi.model.OWLClass; import org.semanticweb.owlapi.model.OWLDataFactory; import org.semanticweb.owlapi.model.OWLOntology; import org.semanticweb.owlapi.model.OWLOntologyCreationException; import org.semanticweb.owlapi.model

问题 I have a simple ontology as follows <?xml version="1.0"?> <!DOCTYPE rdf:RDF [ <!ENTITY owl "http://www.w3.org/2002/07/owl#" > <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" > <!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#" > <!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" > <!ENTITY assignment "http://www.semanticweb.org/shadowman/ontologies/2013/5/assignment#" > ]> <rdf:RDF xmlns="http://www.semanticweb.org/shadowman/ontologies/2013/5/assignment#" xml:base="http://www

问题 I have recently started learning Web Ontology Language (OWL). I want to define a DataProperty with my own defined range of value. Consider the following property: <owl:DatatypeProperty rdf:ID="myProperty"> <rdfs:domain rdf:resource="#MyDomain"/> <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#double"/> </owl:DatatypeProperty> The property has the range of double value but I want to restrict the range in order to make my property to accept only double values between 0 and 1. I would

问题 My work is about library book of recommendation systems . that as input I need book Classification ontology . in my ontology classify library books. this classification has 14 categories, beside the sibling classes Author, book, Isbn. Individuals in book class are book’s subject(about 600 subjects) , and individuals in author class are name’s author and also isbn class. I design this ontology with protege 4.1. also I collected and Have got in part of belong book to categories manually. That a

问题 The rdfs file I'm want to use is cv.rdfs, I want to convert it to SKOS, so I can use it in Maui Indexer I am a complete noob in the subject. Please help. 回答1: SKOS is for organizing concepts, and doesn't deal with properties, it seems, so there's a lot of information in the CV RDFS that doesn't really have a SKOS version. However, it's easy enough to define a mapping for the RDFS classes and generate some data using SPARQL. Here's a possible mapping: rdfs:Class maps to skos:Concept. rdfs

问题 Is it possible in protege (Thus in owl) to describe a class depending if it has some properties? For example I have a class Home , and I want to say that every instance that has property1 and property2 and property2 is considered an instance of that class? 回答1: Suppose you have a class Duck and you want to say that if something walks like a Duck, and talks like a Duck, then it is a Duck. You can do that with a class axiom: ((walksLike some Duck) and (talksLike some Duck)) SubClassOf Duck A

问题 I am trying to grasp the concept of Semantic Web. I am finding it hard to understand what exactly is the difference between RDF and OWL. Is OWL an extension of RDF or these two are totally different technologies? 回答1: The semantic web comes in layers. This is a quick summary of the ones I think you're interested in. Update : Please note that RDFS is used to define the structure of the data, not OWL. OWL describes semantic relationships which normal programming, such as a C struct, isn't