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Querying RDF data

Visualising The Location Graph With Gephi and Ordnance Survey Linked Data

Building on a previous post, the author shares another example using a SPARQL endpoint to query Linked Open Data and turn the results into a [...]

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By |January 13th, 2017|Comments Off on Visualising The Location Graph With Gephi and Ordnance Survey Linked Data

Ordnance Survey Linked Data: A Simple Spatial Query

In this blog post, the author discusses the relative lack of spatial indexes for data in RDF triple stores, compared to data stored in GIS [...]

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By |January 10th, 2017|Comments Off on Ordnance Survey Linked Data: A Simple Spatial Query

Pulling SKOS "prefLabel" and "altLabel" Values Out of DBpedia

In this blog post, the author proposes that DBpedia may be the best source of reusable URIs when one is seeking to describe entities in [...]

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By |January 9th, 2017|Comments Off on Pulling SKOS "prefLabel" and "altLabel" Values Out of DBpedia

Simple Protege Tutorial: Downloading and Running Jena Fuseki Server

In this video, the Jena Fuseki Server is downloaded so that it can be used to run SPARQL queries against the ontology (previously created using [...]

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By |January 8th, 2017|Comments Off on Simple Protege Tutorial: Downloading and Running Jena Fuseki Server

Simple Protege Tutorial: Running SPARQL Queries on Both Ontologies

Building on the previous videos in the series, this final video shows how to use the Jena Fuseki Server issue SPARQL queries against two different [...]

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By |January 8th, 2017|Comments Off on Simple Protege Tutorial: Running SPARQL Queries on Both Ontologies

Simple Protege Tutorial: Running Simple SPARQL Queries

In this video, the Jena Fuseki Server is run on the computer's local host and the ontology file (previously created using the Protege tool) is [...]

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By |January 8th, 2017|Comments Off on Simple Protege Tutorial: Running Simple SPARQL Queries

Wikidata SPARQL Query Tutorial

This video presentation demonstrates how to construct SPARQL queries simply and easily using the Wikidata Query Service. It works through an example of searching for [...]

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By |December 28th, 2016|Comments Off on Wikidata SPARQL Query Tutorial

Federating SPARQL Queries Across Government Linked Data

The author describes how to create a single SPARQL query which pulls Linked Data from two separate endpoints to answer complex questions in cases where [...]

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By |December 28th, 2016|Comments Off on Federating SPARQL Queries Across Government Linked Data

DBPedia SPARQL Endpoint Exercises

This slide tutorial teaches the user how to form SPARQL queries to answer various questions of interest and retrieve results from DBpedia's SPARQL endpoint. In [...]

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By |November 23rd, 2016|Comments Off on DBPedia SPARQL Endpoint Exercises

SPARQL: Using ASK Tutorial and Quiz

This slide tutorial focuses on using ASK in SPARQL queries, but also includes other basic operators. Several examples are provided which include the RDF data [...]

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By |November 23rd, 2016|Comments Off on SPARQL: Using ASK Tutorial and Quiz