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 [...]
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 [...]
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 [...]
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 [...]
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, [...]
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 [...]
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 [...]
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, [...]