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Understands the use of SPARQL functions and operators.

Equality and Inequality in SPARQL

This brief blog post discusses issues surrounding expression semantics in SPARQL. Practices that people are used to from other languages (like the use of "=" [...]

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By |August 13th, 2017|Comments Off on Equality and Inequality in SPARQL

Jena Full Text Search

This documentation explains how to configure and use the Full Text extension to Apache Jena's ARQ (the module is included in Fuseki). The extension combines [...]

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By |August 13th, 2017|Comments Off on Jena Full Text Search

Don’t Use a Hammer to Screw in a Nail: Alternatives to REGEX in SPARQL

This brief blog post explains that regular expressions are expensive to evaluate regardless of what language you are using them in. The author suggests that [...]

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By |August 13th, 2017|Comments Off on Don’t Use a Hammer to Screw in a Nail: Alternatives to REGEX in SPARQL

SPARQL and Linked Data Homework Exercises

This document contains several "written" and "electronic" homework questions originally from the course "Semantic Web Topics" at LeHigh University. They include: Write a series of [...]

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By |January 20th, 2017|Comments Off on SPARQL and Linked Data Homework Exercises

All Roads Lead To? Experiments With Gephi, Linked Data and Wikipedia

This blog post shares an example using the Semantic Web Import plugin (available for the Gephi visualization tool) to create a rather complex geospatial visualization. [...]

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By |January 13th, 2017|Comments Off on All Roads Lead To? Experiments With Gephi, Linked Data and Wikipedia

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

Foundations of RDF Databases

This older presentation presents the argument that the RDF data model can be viewed as an extension of the traditional database model, rather than as [...]

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By |March 9th, 2016|Comments Off on Foundations of RDF Databases

SPARQL Queries for Publications and Authors

This page contains SPARQL queries useful for finding information on authors and publications on VIVO. These query examples, if adapted, have other useful applications as [...]

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By |January 16th, 2016|Comments Off on SPARQL Queries for Publications and Authors

Toward the Web of Functions: Interoperable High-Order Functions in SPARQL

This video addresses the problem needing to know the specific URI of any third-party custom SPARQL function in order for the computation to be executed [...]

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By |January 16th, 2016|Comments Off on Toward the Web of Functions: Interoperable High-Order Functions in SPARQL

Querying the Linked Archives Hub data using SPARQL

This blog post provides a few sample SPARQL queries that can be used as a starting point for exploring an unfamiliar dataset. The queries are [...]

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By |January 16th, 2016|Comments Off on Querying the Linked Archives Hub data using SPARQL