semantic-web

问题 What's the correct way to set domains/ranges of data/object properties in OWL? If I have two classes A , B and a data property hasName : <Declaration><Class IRI="#A"/></Declaration> <Declaration><Class IRI="#B"/></Declaration> <Declaration><DataProperty IRI="#hasName"/></Declaration> <FunctionalDataProperty> <DataProperty IRI="#hasName"/> </FunctionalDataProperty> <DataPropertyRange> <DataProperty IRI="#hasName"/> <Datatype abbreviatedIRI="xsd:string"/> </DataPropertyRange> I want to set

问题 This question already has an answer here : Exclude results from DBpedia SPARQL query based on URI prefix (1 answer) Closed 3 years ago . You can run the query below at the Linked MDB SPARQL Explorer. The values of ?imdbID (the last variable) contains IRIs from one of three possible domains (freebase.com, rottentomatoes.com or imdb.com). I would like to know how to apply a filter such that only the rows from the imdb.com domain are retained. PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

问题 I've been testing Sesame 2.7.2 and I got a big surprise when faced to the fact that DESCRIBE queries do not include blank nodes closure [ EDIT: the right term for this is CBD for concise bounded description ] If I correctly understand, the SPARQL spec is quite loose on that and says that what is returned is actually up to the provider, but I'm still surprised at the choice, since bnodes (in the results of the describe query) cannot be used in subsequent SPARQL queries. So the question is: how

问题 I've studied SPARQL specification on the topic and also found this answer rather interesting. However definitions are complicated enough, so I still don't see the answer for my question. I can't find any example of query with blank nodes that returns different results than the same query with variables in place of blank nodes. For example is there any case when the following queries return different results: SELECT ?a ?b WHERE { ?a :predicate _:blankNode . _:blankNode :otherPredicate ?b . }

问题 I want to create a RDFS schema about venue info which contains for example: only photo and address info. I find another schema about it: https://schema.org/Place. It contains more properties than I need. So, should I make my schema venue as a subclass of https://schema.org/Place? Or I just make a new class but reuse the properties in https://schema.org/Place? Do they have differences? 回答1: The semantic web / linked data lives of the re-use of existing vocabularies, so if you only need a sub

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 Mainly, I was wondering what advantages the ontology languages of RDFS/OWL has over using a markup system (such as http://www.schema.org/) for managing and creating metadata? I'm still very confused about how different concepts of the "Semantic Web" are supposed to fit together in the overall picture... The relation between RDF/RDFS/RDFa? OWL? URIs? and finally, XML and SQL/SPARQL? All the descriptions I've read about so far about them make sense individually, but I'm not sure if I could be

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

问题 Recently, I'm trying to approach semantic web using Jena to create RDF and make query. Now, I have successfully made a owl based RDF file in Jena. However, when I trying to use different ontologies (such as: cidoc-crm), I do not know how to import those ontologies to Jena. Does anyone know how to import them to Jena? Do I need to create a new ontology model? 回答1: Jena's OntModel interface provides a convenient way of working with ontologies (including RDFS ontologies). The following code