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Uses OPTIONAL to formulate queries to return the values of optional variables when available.

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

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

On the Semantics of SPARQL Queries with Optional Matching under Entailment Regimes

This presentation covers the semantics of SPARQL queries with optional matching features under entailment regimes. It argues that normative semantics may lead to answers that [...]

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By |January 16th, 2016|Comments Off on On the Semantics of SPARQL Queries with Optional Matching under Entailment Regimes

Towards Reconciling SPARQL and Certain Answers

SPARQL entailment regimes are strongly influenced by the big body of works on ontology-based query answering, notably in the area of Description Logics (DLs). However, [...]

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By |September 15th, 2015|Comments Off on Towards Reconciling SPARQL and Certain Answers

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

SPARQL Tutorial: Optional Information

This brief tutorial emphasizes that RDF is semi-structured data, which means that SPARQL has the ability to query for data but will fail when that [...]

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By |August 13th, 2015|0 Comments

Simple SPARQL Tutorial: SPARQL query … the OPTIONAL Graph Pattern

Tutorial showing how to modify a query to return instances of data that may or may not exist- the OPTIONAL Graph Pattern.URL: https://www.youtube.com/watch?v=Bu24sfQcyowKeywords: SPARQLAuthor: Sadawi, [...]

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By |August 13th, 2015|0 Comments