Introduction to RDF Query with SPARQL

Part 5 - SPARQL Protocol

Andy Seaborne

Hewlett-Packard Laboratories, Bristol

Learning Goals

Understand the role of the SPARQL protocol
See some examples

Non-goal:

To know the SPARQL protocol

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SPARQL - Protocol

Publish RDF
Remote Access = Query Language and Protocol
Work in progress
Will provide WSDL for HTTP AND XMLP (SOAP) bindings

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HTTP Example 1

Redland Rasqal RDF Query Demonstration

Implemented as CGI

Parameter	Value/Use
query	Query string
query-lang	"sparql", "rdql"
data	Target graph
format	Output format: "rdfxml", "xml", "turtle", ...
output-xslt	URI of XSLT stylesheet
limit	Integer

HTTP Example 2

SPARQLer - based on Joseki

Uses Jena (ARQ for SPARQL queries)
Output format by Content Negotiation
No graph-id => take base URL as target

Parameter	Value/Use
lang	"sparql", "rdql"
query	Query string
graph-id	Target graph
stylesheet	URI of XSLT stylesheet

Copyright

Copyright 2005 Dave Beckett, Steve Harris, Eric Prud'hommeaux and Andy Seaborne. Terms of use are given on the main Introduction to RDF Query with SPARQL Tutorial page.