The SPARQL endpoint at localhost:3000/sparql allows to run queries directly. Use this query to retrieve all links available on a Databus. The link you uploaded in the previous step should be in the result. See more examples of the SPARQL queries in examples. PREFIX dcat: <http://www.w3...
For new questions they have to decide which datasets are suitable and in which terminology and modelling style to phrase the SPARQL query. In this work we present an evolutionary algorithm to help with this challenging task. Given a training list of source-target node-pair examples our algorithm...
优化查询:通过优化查询语句,减少查询的复杂度和执行时间。可以使用SPARQL查询语言的优化技巧,如使用FILTER语句限制结果集大小,使用LIMIT和OFFSET进行分页查询等。 增加超时时间:可以通过设置合适的超时时间来延长查询的执行时间。可以使用Apache Jena提供的QueryExecution类的setTimeout方法来设置超时时间,单位为毫秒。
We use the following query as selection for this example and write it to the filetest.sparql: echo "PREFIX dcat: <http://www.w3.org/ns/dcat#> PREFIX databus: <https://dataid.dbpedia.org/databus#> SELECT ?file WHERE { GRAPH ?g { ?dataset databus:artifact <https://dev.databus....
Jena知识存储及SPARQL知识检索》中讲到如何将处理后的RDF数据存储至Apache Jena数据库之中、如何利用SPARQL...
DBpedia: A Nucleus for a Web of Open Data.pdf,DBpedia: A Nucleus for a Web of Open Data 1,3 2 2 1 S¨oren Auer , Christian Bizer , Georgi Kobilarov , Jens Lehmann , Richard Cyganiak2 , and Zachary Ives3 1 Universit¨at Leipzig, Department of Computer Sc
Based on this modeling, the following SPARQL query retrieves the Twitter account (if any) aligned to an entity identified by any of its localized DBpedia URIs<E>: Table 1. Dataset statistics by DBpedia entity type. Full size table
.org/ns/prov#> PREFIX dataid: <http://dataid.dbpedia.org/ns/core#> PREFIX dataiddebug: <http://dataid.dbpedia.org/ns/debug.ttl#> PREFIX dcat: <http://www.w3.org/ns/dcat#> # group_concat see: https://stackoverflow.com/questions/18212697/aggregating-results-from-sparql-query ...
dbpedia.sparqlEndpoint: SPARQL endpoint to send requests to ontology.file: Path to DBpedia ontology; this has to be replaced upon DBpedia update window.maxWindowLimit: Maximum value of the windowing query parameter prefixes.file: Path to the file containing namespace prefixes ...
Cool extensions for Openlayers (ol) - animated clusters, CSS popup, Font Awesome symbol renderer, charts for statistical map (pie/bar), layer switcher, wikipedia layer, animations, canvas filters. - ol-ext/doc/doc-pages/ol.source.DBPedia.html at 6123963c