sparql

问题 I need to search items in two graphs with the same string, but different language codes ("xx"@en and "xx"@eng - from wordnet). obviously "xx"@en is not equal to "xx"@eng. it can be done with (prefix nlp suitably defined): select * where { ?a nlp:lemma ?as . ?b rdfs:label ?bs . filter (str(?as)=str(?bs)) . # more code using ?a and ?b } However, this query takes too long and is wasteful. It should be possible to do something like: ?a nlp:lemma ?s . ?b rdfs:label ?s . but i cannot see how -

问题 I am using python library RDFLIB to query on semantic dicom owl file. I need to query for a label containing letter mu. I am not able to figure out how to query for labels containing this letter. The code is given below - q = """SELECT ?ur WHERE{?ur rdfs:label "Exposure in uAs".}""" qres = g.query(q) for row in qres: print(row) I am not getting any results for the above query. The semantic dicom owl files contain the following triples - Image of what I am trying to search contents of sedi

问题 Given an RDF::URI and a SPARQL property path (stored as a String), I want to find values that satisfy the following query SELECT ?value WHERE { <URI> <property_path> ?value . } I managed to get by using the following snippet, but is feels very hackish: query = SPARQL.parse(<<~QUERY) SELECT ?value WHERE { <#{uri}> #{property_path} ?value } QUERY graph.query(query) Is there a better way to achieve this, using a RDF::Query for example? 回答1: From my understanding, you consider string

问题 I want to extract graphs for 5 individuals who are Film(or movies) from DBPedia. My query is: ParameterizedSparqlString qs = new ParameterizedSparqlString( "" + "construct{?s ?p ?o}"+ "where{?s a http://dbpedia.org/ontology/Film ."+ "?s ?p ?o"} OFFSET 0 LIMIT 5" ); I get the following result: 1- http://dbpedia.org/resource/1001_Inventions_and_the_World_of_Ibn_Al-Haytham http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://dbpedia.org/ontology/Film . 2- http://dbpedia.org/resource/1001

问题 I would run this query: SELECT DISTINCT ?id str(?name) but Fuseki give me this error: This line is invalid.Expected ( VAR1... I would need a string value of ?name . 回答1: I suppose you are talking about something like this. This message is a warning produced by Fuseki component called YASGUI (or rather YASQE). You have two options: Use more conformant syntax, i. e. SELECT DISTINCT ?id (str(?name) AS ?str_name) etc. Ignore this warning and run your query, Jena ARQ should accept it and return a

问题 I have a SPARQL query that returns results in the Stardog query panel when inference is enabled, but not when it's disabled. When I try the query through python with SPARQLwrapper, I get no results. I tried with a different query, which doesn't rely on inference, and got the same results through the Stardog query panel without inference and through SPARQLwrapper. So I suspect reasoning is not being applied when I query through python, and that this is why there's no results. So my question is

问题 I have a list of instances as follows. myinstances = ['word2vec', 'tf-idf', 'dijkstra's algorithm'] For each myinstance in the above list, I want to find: 1. What are the other instances of `myinstance`'s category (i.e. only one hop) 2. What are the instances of `myinstance`'s category's category (i.e. two hops) For example, if we consider myinstance = word2vec What are the other instances of myinstance 's category (i.e. only one hop)? As shown in the figure below the other instances of its

问题 I can't understand why with this query I can't get movement and genre labels: SELECT DISTINCT ?item ?itemLabel ?value ?inception ?creatorLabel ?image (group_concat(?genreLabel; separator=", ") AS ?genres) (group_concat(?movementLabel; separator=", ") AS ?movements) WHERE { ?item wdt:P4610 ?value; wdt:P18 ?image. #with an image OPTIONAL { ?item wdt:P571 ?inception; #optionally with creationdate wdt:P170 ?creator; #Optionally with creator wdt:P136 ?genre; wdt:P135 ?movement. } SERVICE wikibase

问题 I have my data organised in multiple graphs. The graph in which a triple is saved matters. The data structure is complicated but it can be simplified like this: My store contains cakes, where there's a hierarchy of different cake types, all subclasses of <cake> <http://example.com/a1> a <http://example.com/applecake> <http://example.com/a2> a <http://example.com/rainbowcake> ... Depending on how they get created by a user in a UI, they end up in a different graph. If for instance the user

问题 I need to retrieve a single image for each resource in a target set, testing multiple non-exclusive predicates with a priority order. I'm currently using a standard OPTIONAL fallback pattern along the lines of select ?r ?i where { ?r a dbo:Automobile . optional { ?r <http://dbpedia.org/ontology/thumbnail> ?i } optional { ?r <http://xmlns.com/foaf/0.1/depiction> ?i } optional { ?r <http://xmlns.com/foaf/0.1/logo> ?i } optional { ?r <http://schema.org/image> ?i } } but this approach is turning