sparql

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OpenLink Virtuoso: Finding if two nodes are connected within a certain distance

How can I find the distance between 2 nodes in a graph using Virtuoso? I\'ve read the Transitivity documentations but they limit you to one predicate e.g.:[详细]

2023-01-19 12:05 分类：问答
Visualization with JavaScript of data from a JSON source?

I would like to use a library like the Google Visualization API to draw charts, but taking the data as JSON from an external source. The context is to use some SPARQL service to extract the data from[详细]

2023-01-18 06:46 分类：问答
How do I write a SPARQL query? [closed]

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time,or an extraordinarily narrow situation that is not generally applic[详细]

2023-01-18 02:42 分类：问答
Determine if a specific triple exists using SPARQL

If the data set is: @prefix dc:<http://purl.org/dc/elements/1.1/> . @prefix :<http://example.org/book/> .[详细]

2023-01-15 01:41 分类：问答
Neo4j vs OpenLink Virtuoso

I\'ve been using OpenLink Virtuoso as an RDF store for some time now and although it\'s great with large data, I\'m not satis开发者_运维问答fied with the graph traversal performance using SPARQL. Rece[详细]

2023-01-12 07:33 分类：问答
How do I query/update a remote RDF-endpoint with Jena

I would like to send updates to a remote endpoint over http. I have found that joseki serves as such an endpoint.[详细]

2023-01-11 22:46 分类：问答
Querying Project Gutenberg catalog.rdf via SPARQL

I\'m having difficulty structuring a SPARQL query for the Project Gutenberg catalog (available at Gutenberg Feeds toward the bottom of the page).I know it is a fundamental lack of understanding on my[详细]

2023-01-08 13:50 分类：问答
Sparql skos:broader

I\'m doing a SPARQL query on the DBpediaset, but I am having some issues (due to lack of detailed SPARQL knowledge) with a query limitation:[详细]

2023-01-08 01:21 分类：问答
How to use logical OR in SPARQL regex()?

I\'m using this line in a SPARQL query in my python program: FILTER regex(?name, \"%s\", \"i\" ) (where %s is the search text entered by the user)[详细]

2023-01-07 13:04 分类：问答
SPARQL - what does it take to find an ontology?

I\'m pretty new to SPARQL, OWL and Jena, so please excuse if I\'m asking utterly stupid questions. I\'m having a problem that is driving me nuts since a couple of days. I\'m using the following String[详细]

2023-01-05 06:33 分类：问答