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Uses UNION to formulate queries with multiple possible graph patterns.

Ordnance Survey Linked Data: A Simple Postcode Query

This blog post shares give some simple examples of what can be done with the Code-Point(R) Open dataset, available as Linked Open Data (LOD). This [...]

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By |January 15th, 2017|Comments Off on Ordnance Survey Linked Data: A Simple Postcode Query

Ordnance Survey Linked Data: Simple SPARQL Example

This blog post shares how to retrieve several variables of data from the Ordnance Survey dataset, available as Linked Open Data (LOD). Includes SPARQL queries [...]

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By |January 15th, 2017|Comments Off on Ordnance Survey Linked Data: Simple SPARQL Example

Ordnance Survey Linked Data: Combining Postcode and Spatial Queries

Building on previous blog posts, the author shows how to query and combine data from two different datasets. Although the datasets were published by the [...]

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By |January 15th, 2017|Comments Off on Ordnance Survey Linked Data: Combining Postcode and Spatial Queries

SPARQL: Using Operators Tutorial and Quiz

This slide tutorial focuses on using various operators in SPARQL queries. Several examples are provided which include the RDF data being queried, the SPARQL query [...]

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

Example SPARQL queries

This page, which contains SPARQL tools, tips, sample queries, is just starting out and the authors hope it can become a resource for useful snippets [...]

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By |January 16th, 2016|Comments Off on Example SPARQL queries

Updating RDFS ABoxes and TBoxes in SPARQL

Updates in RDF stores have recently been standardized in the SPARQL 1.1 Update specification. However, computing answers entailed by ontologies in triple stores is usually [...]

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By |September 15th, 2015|Comments Off on Updating RDFS ABoxes and TBoxes in SPARQL

SPARQL Tutorial: Alternatives in a Pattern

This brief tutorial shows that another way of dealing with the semi-structured nature of RDF data is to query for one of a number of [...]

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By |August 13th, 2015|0 Comments

Simple SPARQL Tutorial: Using the UNION Keyword

Tutorial showing how to modify a query to combine the results of two separate graph patterns (or conditions) using the UNION keyword. The topic is [...]

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By |August 13th, 2015|0 Comments

Simple SPARQL Tutorial: More on SPARQL UNION

Tutorial explaining how the UNION keyword works using RDF principles. Topic is continued from the last video of the series, which showed an example of [...]

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By |August 13th, 2015|0 Comments

Simple SPARQL Tutorial: Subqueries (Queries Inside Queries)

Tutorial explaining how the it is possible to nest one query within another query in order to avoid the queries running independently (and thus returning [...]

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By |August 13th, 2015|0 Comments