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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
SPARQL: Using DESCRIBE and CONSTRUCT Tutorial and Quiz
This slide tutorial focuses on using DESCRIBE and CONSTRUCT in SPARQL queries, but also includes other basic operators. Several examples are provided which include the [...]
SPARQL: Using SELECT Tutorial and Quiz
This slide tutorial focuses on using SELECT in SPARQL queries, but also includes other basic operators. Several examples are provided which include the RDF data [...]