rdf

问题 I am trying to parse freebase dump file freebase-rdf-2014-01-12-00-00.gz (25 GB) using Jena. There has been many issues reported by Jena regarding bad data. Example - 150.0 not valid,true and false values not valid These issues I have resolved by adding double quotes around decimal and true/false in dump file. However issues are still being reported by Jena.(current - org.apache.jena.riot.RiotException: [line: 161083, col: 110] Illegal object: [MINUS]) Is there any way to pre process this

问题 I am modelling university data using an OWL ontology with relevant classes, object properties, etc. I have the university data lying in a simple text file (say CSV). I want to create ontologies using my model for these data. My questions are: Is this how ontologies work? If so, how can this be done using using Jena? 回答1: If I understood your question, you have an ontology that represents a university model and you want to create owl instances using the data set which is in the form of CSV.

问题 I am modelling university data using an OWL ontology with relevant classes, object properties, etc. I have the university data lying in a simple text file (say CSV). I want to create ontologies using my model for these data. My questions are: Is this how ontologies work? If so, how can this be done using using Jena? 回答1: If I understood your question, you have an ontology that represents a university model and you want to create owl instances using the data set which is in the form of CSV.

问题 Visitng http://dbpedia.org/resource/Cupertino shows the DBpedia RDF information about Cupertino. As you can see, it has, among others, the property and value: dbpedia-owl:type dbpedia:City However, this query on the DBpedia endpoint returns no results: SELECT ?type WHERE { dbpedia:Cupertino dbpedia-owl:type ?type } SPARQL results Why can't I retrieve the value of the dbpedia-owl:type property? 回答1: You've got an interactive webservice in front of you, and one of the most useful things that

问题 A sample RDF dataset has entries owl#NamedIndividual grouped by owl#Class and a custom relation named IsMemberOf . When I try to obtain a list of results segregated by their type, it works well but the moment I add a way to obtain their corresponding IsMemberOf I don't get expected results. Here is three SPARQL 1.1 queries I gave to Virtuoso (sample dataset below): Query 1 sparql select * from <test> where { #If I uncomment the next line I don't get the proper results # ?s <IsMemberOf>

问题 This is my minimum data: PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX rs: <http://www.SemanticRecommender.com/rs#> PREFIX mo: <http://www.musicontology.com/mo#> PREFIX : <http://www.musicsemanticontology.com/mso#> mo:5th_symphony_for_beethoven a mo:GermanSymphony . :symphonyFestival2016 a rs:TemporalContext ; rs:appliedOnItems mo:GermanSymphony ; rs:canBeRecommendedFrom "2016-07-01T00:00:00-00:00"^^xsd:dateTime ; rs

问题 I've and OWL file and I can explore it and navigate through classes and properties but I can't retrieve correct range of ObjectProperty. This is part of my OWL file: <owl:ObjectProperty rdf:about="&aat;aat2209_located_in"> <rdfs:label xml:lang="en">located in</rdfs:label> <rdfs:label xml:lang="it">si trova in</rdfs:label> <rdfs:comment xml:lang="en">The property defines a relationship between places or places and things</rdfs:comment> <rdfs:comment xml:lang="it">La proprietà definisce la

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . I have a large set of raw structured datasets in CSV and HDF5 format. I would usually upload these to a web server as they are, but what steps are required to incorporate this data to the semantic web? 回答1: Tim Berners-Lee defined the 5 stars of Linked Open Data. Assuming that

问题 I have Virtuoso 7.10 and command VALUES works for 1*x or x*1 asign to tables like: SELECT * WHERE { VALUES (?z ?r ?t) { ("x" "y" "z") } } and for: SELECT * WHERE { VALUES ?z { "x" "y" "z" } } But the problem is when i try to assign like this: SELECT * WHERE { VALUES (?z ?r ?t) { ("x" "y" "z") ("xy" "yx" "zx") } } then in result, i have only first column filled, but other two are empty (same as with two column). Is it a bug or am I doing something wrong? Is there a workaround? 来源： https:/

问题 I have Virtuoso 7.10 and command VALUES works for 1*x or x*1 asign to tables like: SELECT * WHERE { VALUES (?z ?r ?t) { ("x" "y" "z") } } and for: SELECT * WHERE { VALUES ?z { "x" "y" "z" } } But the problem is when i try to assign like this: SELECT * WHERE { VALUES (?z ?r ?t) { ("x" "y" "z") ("xy" "yx" "zx") } } then in result, i have only first column filled, but other two are empty (same as with two column). Is it a bug or am I doing something wrong? Is there a workaround? 来源： https:/