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Questions tagged [fuseki]

Fuseki is a SPARQL server. It provides REST-style SPARQL HTTP Update, SPARQL Query, and SPARQL Update using the SPARQL protocol over HTTP.

Apache Jena Fuseki is a SPARQL server. It can run as a operating system service, as a Java web application (WAR file), and as a standalone server.

It provides the SPARQL 1.1 protocols for query and update as well as the SPARQL Graph Store protocol.

Fuseki is tightly integrated with TDB to provide a robust, transactional persistent storage layer, and incorporates Jena text query and Jena spatial query. It can be used to provide the protocol engine for other RDF query and storage systems.

423 questions
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CONSTRUCT into a named graph

I am attempting to use a SPARQL Construct query to create a new named graph from an existing one. The database I am querying contains http://graph.com/old as an existing named graph. I am using Jena TDB as the database, accessed through a Jena…
Yoav Zimmerman
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What is the SPARQL query to get the name of all graphs existing in my triplestore?

I want to get the name of all existing graphs in my Fuseki server, it should return a message with a list of all graphs name.
user3457185
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Named Graphs v Default Graph behaviour in Apache Jena Fuseki

We are running Apache Jena Fuseki. If we upload graphA and graphB SELECT (COUNT(*) as ?count) FROM FROM WHERE { ?s ?p ?o . } gives 100 If we upload triples in A and B into Default SELECT (COUNT(*) as ?count) WHERE { ?s ?p ?o…
Ribeye
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fuseki webinterface does not show datasets

I have installed fuseki and start the server with #!/bin/sh cd /home/frank/localInstall/jena/apache-jena-fuseki-2.5.0 exec /home/frank/localInstall/jena/apache-jena-fuseki-2.5.0/fuseki-server -v --update --mem /testDB The server is working and…
user855443
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SPARQL functions in CONSTRUCT/WHERE

I mostly use SPARQL SELECT while working on a query for debugging purposes but in the end I want to use the final result it in a CONSTRUCT way; as I want to work with a graph and not key/value query results. What I don't get yet (and can't seem to…
Adrian Gschwend
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How to calculate maximum degree of a directed graph using SPARQL?

I have computed the indegree and outdegree of each node in the directed graph in two separate queries: SELECT ?s (COUNT(*) AS ?outdegree) { ?s ?p ?o } GROUP BY ?s ORDER BY DESC(?outdegree) SELECT ?o (COUNT(*) AS ?indegree) { ?s ?p ?o } GROUP BY…
user3451166
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Fuseki GC overhead limit exceeded during data import

I'm trying to import LinkedMDB (6.1m triples) into my local version of jena-fuseki at startup: /path/to/fuseki-server --file=/path/to/linkedmdb.nt /ds and that runs for a minute, then dies with the following error: Exception in thread "main"…
Kristian
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Querying large RDF Datasets out of memory

I want to download two or more datasets on my machine and be able to start a SPARQL endpoint for each. I tried Fuseki which is part of the Jena project. However, it loads the whole dataset in memory, which is not very much desired if I'm intending…
user2467278
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Reasoning with Fuseki, TDB and named graphs?

I'm serving a dataset containing 10-20 named graphs from a TDB dataset in Fuseki 2. I'd like to use a reasoner to do inference on my data. The behaviour I'd like to see is that triples inferred within each graph should appear within those graphs…
Johan Nystrom
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Query multiple TDB Datasets

Using: jena-fuseki-1.1.0, apache-jena-2.12.0 What I want to achieve and my current state: I am trying to set up a local jena-fuseki server with the dbpedia Persondata (English and German), Inter-Language Links, Images and Links to Wikipedia Article…
Fabian
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How do you use user defined functions in fuseki?

I have a Fuseki endpoint running on some server. I would like to pass user defined functions using Jena's com.hp.hpl.jena.sparql.function library. Unfortunately, I get the error: URI has no registered function…
ybt195
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Reasoning in Apache Jena Fuseki: "Reload" dataset or "trigger" inference

We have an Apache-Fuseki Server running with the following configuration: @prefix : . @prefix tdb: . @prefix tdb2: . @prefix rdf: …
hsteinmueller
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Limit Jena Fuseki's CURL access to localhost only

I'm in the process of finishing an RDF server. The requirements for the project are: 1) Triple Store that can be queried online. 2) Two RDF's that need to be generated on a weekly basis; (based on new data import) 3) Generation and import of those…
Clueless_captain
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SPARQL group by and order by: not ordered

I follow up on query where the schema.org database is used to find the number of children of a class - as a simpler database than my application. I want to get the names of the children concatenated in alphabetic order. The query: prefix schema: …
user855443
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Fuseki SPARQL INSERT produces the "Error 400: SPARQL Query: No 'query=' parameter"

I try to insert an individual into my ontology, but get the error: Error 400: SPARQL Query: No 'query=' parameter Fuseki - version 2.4.1 (Build date: 2016-11-04T18:59:20+0000) This is my SPARQL INSERT query #1: PREFIX rdf:…
Dinosaurius
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