SPARQL is an acronym that stands for SPARQL Protocol and RDF Query Language. It is considered a key semantic web technology that allows for a query to consist of triple patterns, conjunctions, disjunctions, and optional patterns. DataWiki allows you to query remote data sources that expose their data with "SPARQL endpoints", i.e. a (referenceable) web resource and knowledge base that enables users (human or other) to query via the SPARQL 1.1 language. There is a growing number of endpoints providing huge amounts of data in manifold domains. This sandbox contains examples of what kinds of queries and visualizations are possible with DataWiki.

Note:

This sandbox requires the TripleStore basic or professional.

Examples for queries formulated in SPARQL 1.1 that fetch data from remote sources

• Farm Employees - This query lists the number of employees on British farms.
• Farm Types - These queries show number of different farm types in Great Britain over time.
• NewYork places - Gives you a google map indicating places within a 20 kilometers radius of New York City (ATTENTION: loading time is ca. 2 minutes!)

The following pages contain queries against the CIA World Factbook.

• Govermental forms - This query results in nice plots about the distribution of governmental forms world-wide and in Europe
• Electricity production Netherlands - Did you know that under 5 per cent of Netherlands electricity production is nuclear based?
• CIA Factbook - Delivers all countries on earth with their capitals and population. China has the most inhabitants in the world: 1.3 billion people.
• CIA Factbook 2 - Short descriptions of many countries of the world covering historical and political background.

Note:

The SPARQL endpoint used on these pages is currently off-line.

Technical information

• Maintainer:DIQA GmbH
• Version: 1.2.0
• Patch level: 6
• Installation dir: extensions/Sparqlsandbox
• Dependencies:
  • semanticmaps (1.0.5, ?)
  • semanticresultformats (1.6.2, ?)
  • Datawiki (1.7.1, ?)
  • tsc (1.7.1, ?)
• This sandbox provides examples for demonstrating the power of SPARQL querying of SPARQL endpoints in combination with a TripleStore.

Sparqlsandbox