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Formulates advanced queries on data containing blank nodes.

Expressive Languages for Querying the Semantic Web

SPARQL 1.1 was recently released, which includes entailment regimes for RDFS and OWL vocabularies and a mechanism to express navigation patterns through regular expressions. Unfortunately, [...]

By |September 15th, 2015|Comments Off on Expressive Languages for Querying the Semantic Web

Using SPARQL with RDFS and OWL Entailment

This chapter accompanied the lecture on SPARQL with entailment regimes given at the 7th Reasoning Web Summer School in Galway, Ireland, 2011. It first introduces [...]

By |September 15th, 2015|Comments Off on Using SPARQL with RDFS and OWL Entailment

SPARQL Beyond Subgraph Matching

This paper describes the extension of the Semantic Web query language SPARQL by defining the semantics of SPARQL queries under the entailment regimes of RDF, [...]

By |September 15th, 2015|Comments Off on SPARQL Beyond Subgraph Matching

Schema-Agnostic Query Rewriting in SPARQL 1.1

SPARQL 1.1 supports the use of ontologies to enrich query results with logical entailments, and OWL 2 provides a dedicated fragment OWL QL for this [...]

By |September 15th, 2015|Comments Off on Schema-Agnostic Query Rewriting in SPARQL 1.1

Foundations of Semantic Web Technologies: SPARQL Entailment Regimes

Slides covering the following topics: SPARQL can now be used with RDF Schema, OWL, and RIF semantics. Entailment Regimes overwrite evaluation of basic graph patterns. [...]

By |September 15th, 2015|Comments Off on Foundations of Semantic Web Technologies: SPARQL Entailment Regimes

SPARQL 1.1 Entailment Regimes

There are different possible ways of defining a basic graph pattern matching extension for an entailment relation. This document specifies one such way for a [...]

By |September 15th, 2015|Comments Off on SPARQL 1.1 Entailment Regimes

SPARQL: Querying the Web of Data

This slide-set aims to introduce the RDF query language SPARQL "from a user's perspective". This presentation predates the introduction of SPARQL 1.1, but may still [...]

By |August 13th, 2015|0 Comments

From SQL to SPARQL

This presentation gives an overview of the SPARQL query language and how it is different than SQL, which is used for relational databases. Mentions several [...]

By |August 13th, 2015|0 Comments

Simple SPARQL Tutorial: Understanding Blank Nodes

This tutorial explains the purpose of blank nodes and gives a brief demonstration of their use.URL: https://www.youtube.com/watch?v=jnL9ZqLHJj0Keywords: SPARQL, Blank nodesAuthor: Sadawi, NoureddinDate created: 2014-03-03 07:00:00.000 [...]

By |August 13th, 2015|0 Comments

Introduction to SPARQL

A simple (yet thorough) introduction to SPARQL query language based on the W3C documentation. Focuses on aspects of the query language present in SPARQL 1.0 [...]

By |August 13th, 2015|0 Comments