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Sparql a simple knowledge query
- 1. SPARQL : A Simple Knowledge Query STANLEY WANG SOLUTION ARCHITECT, TECH LEAD @SWANG68 http://www.linkedin.com/in/stanley-wang-a2b143b
- 2. Querying RDF data • RDF is a directed, labeled graph data format for representing the first layer information in semantic web standards; • Query patterns are like RDF triples except that each of the subject, predicate and object may be a variable; SPARQL • W3C standard recommendation in Q3 2007 • A query language based on graph patterns • Protocol layer for using SPARQL over HTTP • SPARQL endpoints on the Web • SPARQL used to construct graphs SPARQL stands for Protocol and RDF Query Language
- 3. 3 SPARQL as a Unifying Source SPARQL in 3 Parts 1. Query Language 2. Result Format 3. Access Protocol
- 4. SPARQL Query SELECT ... FROM ... WHERE { ... } SELECT clause to identify the values to be returned FROM clause to identify the data sources to query WHERE clause the triple/graph pattern to be matched against the triples/graphs of RDF a conjunction of triples: { ?x rdf:type ex:Person ?x ex:name ?name } PREFIX declare the schema used in the query
- 5. Example Persons and their Names 5 PREFIX ex: <http://inria.fr/schema#> SELECT ?person ?name WHERE { ?person rdf:type ex:Person ?person ex:name ?name . }
- 6. 6 <?xml version="1.0"?> <sparql xmlns="http://www.w3.org/2005/sparql-results#" > <head> <variable name="person"/> <variable name="name"/> </head> <results ordered="false" distinct="false"> <result> <binding name="person"> <uri>http://inria.fr/schema#fg</uri> </binding> <binding name="name"> <literal>gandon</literal> </binding> </result> <result> ...
- 7. with HTTP Binding GET /sparql/?query=<encoded query> HTTP/1.1 Host: www.inria.fr User-agent: my-sparql-client/0.1 SPARQL Protocol • Sending Queries and their Results Across the Web with SOAP Binding <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <soapenv:Body> <query-request xmlns="http://www.w3.org/2005/09/sparql- protocol-types/#"> <query>SELECT ?x ?p ?y WHERE {?x ?p ?y}</query> </query-request> </soapenv:Body> </soapenv:Envelope>
- 8. • We need to associate a number of factors, including hospital type and facilities – its accessibility after a disaster – and the staff available • The query needs to be structured based on Concepts & Relationships that can be retrieved and then customized for the specific query. • Using this approach, a listing of the hospitals capable of dealing with large number of burn cases is returned to the user and information associated with the query retrieved. A “Simple” Knowledge Query Which hospitals within 30 mins of Alpine, CA provide burn treatment?”