semantic-web

问题 Suppose I'm defining an OWL ontology for family relationships, and I've already defined the relationships "sister-of" and "parent-of". I'd now like to define a relationship "aunt-of" and specify that this relationship is implied by a chain of the other two. In other words: if X "sister-of" Y, and Y "parent-of" Z, then X "aunt-of" Z. Is there a way to do this? It's similar to owl:TransitiveProperty but that obviously doesn't work. It's also in the same general vein as "owl:inverseOf" in terms

问题 Currently, Wikidata has a SPARQL endpoint "https://query.wikidata.org/", I would like to query this site using Jena (3.0.1), I use the following code but I got an error message " Endpoint returned Content-Type: text/html which is not currently supported for SELECT queries ". Is there a way to solve it? the same code works fine with dbpedia. Thanks queryString = "PREFIX bd: <http://www.bigdata.com/rdf#>\n" + "PREFIX wikibase: <http://wikiba.se/ontology#>\n" + "PREFIX wdt: <http://www.wikidata

问题 Assuming two types of classes, one (A) "isManagedBy" by the other (B). The following owl snipped illustrates this scenario. There are multiple classes of type A (which are "managed by" other classes) and multiple classes of B. In fact, there is also a hierarchy between between classes bot of type A and B. <owl:ObjectProperty rdf:about="#isManagedBy"/> <owl:Class rdf:about="#FunctionManagement"> <rdfs:subClassOf rdf:resource="..."/> <rdfs:subClassOf> <owl:Restriction> <owl:onProperty rdf

问题 Is it possible to bound the length of property path? For example getting all the triples with lengths that are between (m,n) or all that are not between this range? For instance, how could this be done with the following query? select ?x ?y where {?x p* ?y} 回答1: Some endpoints support this directly Some SPARQL engines support a method for doing this directly, with a regular-expression-like syntax. E.g., ?s :p{n,m} ?o would be a path with a length between n and m. That syntax is described in

问题 Is it possible to bound the length of property path? For example getting all the triples with lengths that are between (m,n) or all that are not between this range? For instance, how could this be done with the following query? select ?x ?y where {?x p* ?y} 回答1: Some endpoints support this directly Some SPARQL engines support a method for doing this directly, with a regular-expression-like syntax. E.g., ?s :p{n,m} ?o would be a path with a length between n and m. That syntax is described in

问题 I'm using the pellet reasoner on a number of ontologies and have run the info method on a list of IRIs (in this case URLs). The two metrics that interest me are the DL Expressivity and OWL Profile. The OWL Profiles I'm getting range from "OWL 2," "OWL 2 DL," "OWL 2 EL," "OWL 2 QL," "OWL 2 RL." When is says "OWL 2," does that mean the ontology is OWL 2 full? Are all the other variations DL? I have found a spec describing the different profiles (table 10 especially) [as a new user I can't post

问题 This question already has an answer here : Querying a Graph path in SPARQL (1 answer) Closed 4 years ago . We have the following turtle dataset representing a graph where we want to observe some properties. @prefix v1: <http://localhost:9091/graphe/> . @prefix v2: <http://localhost:9091/graphe#> . v1:a v2:p v1:b. v1:a v2:q v1:f. v1:a v2:p v1:g. v1:b v2:p v1:c. v1:c v2:q v1:h. v1:c v2:p v1:i. v1:c v2:p v1:d. v1:d v2:p v1:e. v1:f v2:p v1:g. v1:f v2:q v1:l. v1:f v2:p v1:k. v1:g v2:p v1:c. v1:g

问题 I cannot understand the difference between OWL-LIST and RDF-LIST. Secondly why OWL-DL do not support RDF-LIST due to OWL serialisation why? and how i can create OWL-LIST in OWL-DL 回答1: As mentioned in the comments, I don't think that there is any standard thing called OWL-LIST. There is a CO-ODE List Ontology that might be of interest to you if you need to represent lists in OWL: Description A set of entities used to describe the OWL list pattern. (see http://owl-workshop.man.ac.uk

问题 I cannot understand the difference between OWL-LIST and RDF-LIST. Secondly why OWL-DL do not support RDF-LIST due to OWL serialisation why? and how i can create OWL-LIST in OWL-DL 回答1: As mentioned in the comments, I don't think that there is any standard thing called OWL-LIST. There is a CO-ODE List Ontology that might be of interest to you if you need to represent lists in OWL: Description A set of entities used to describe the OWL list pattern. (see http://owl-workshop.man.ac.uk

问题 Recently I have been trying to learn Semantic Web. For a project I need to retrieve data from a given dbPedia link. e.g http://dbpedia.org/page/Berlin . But when retrieve data using java.net.URLConnection I get the html data. How can I get the xml from the same link ? I know that there is link in every dbpedia page to download the XML but that is not what I want to do. Thanks in advance. 回答1: Note that the URI of the resource is actually http://dbpedia.org/resource/Berlin (with resource , not