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Querying the Semantic Web with SPARQL

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Emanuele Della Valle
Emanuele Della Valle

This document provides an overview of SPARQL, the query language for the Semantic Web. SPARQL allows querying RDF data by matching triple patterns and combining them with operations like optional and union patterns. Key features discussed include the anatomy of SPARQL queries, matching RDF literals and numerical values, filtering solutions, and defining datasets with the FROM clause. The document also covers SPARQL result forms and resources for learning more about SPARQL implementations and extensions.

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[object Object],[object Object],[object Object],Querying the Semantic Web with SPARQL
Share, Remix, Reuse — Legally ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Query: SPARQL
SPARQL in a nutshell What is SPARQL? ,[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell Why SPARQL? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell Anatomy of a SPARQL query
SPARQL in a nutshell Triple Pattern Syntax ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell Writing a Simple Query ,[object Object],[object Object],[object Object],[object Object],?s http://dbpedia.org/resource/Budesonide http://dbpedia.org/resource/Aciclovir http://dbpedia.org/resource/Salbutamol …
SPARQL in a nutshell Writing a bit more complex query ,[object Object],[object Object],[object Object],[object Object],?drug ?category http://dbpedia.org/resource/Budesonide http://dbpedia.org/resource/Category:Glucocorticoids http://dbpedia.org/resource/Budesonide http://dbpedia.org/resource/Category:Asthma http://dbpedia.org/resource/Aciclovir http://dbpedia.org/resource/Category:Antivirals http://dbpedia.org/resource/Aciclovir http://dbpedia.org/resource/Category:Purines … …
SPARQL in a nutshell Basic Patterns ,[object Object],[object Object]
SPARQL in a nutshell Matching RDF literals – Language Tag 1/2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell Matching RDF literals – Language Tag 2/2 ,[object Object],[object Object],[object Object],[object Object],[object Object],?drug http://dbpedia.org/resource/Budesonide
SPARQL in a nutshell Matching RDF literals – numerical values ,[object Object],[object Object],[object Object],[object Object],[object Object],?drug http://dbpedia.org/resource/Propranolol
SPARQL in a nutshell RDF Term Constraints ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],?drug ?mp http://dbpedia.org/resource/Levorphanol 23 http://dbpedia.org/resource/Streptomycin 12 … …
SPARQL in a nutshell RDF Term Constraints – regex ,[object Object],[object Object],[object Object],[object Object],[object Object],?drug ?c http://dbpedia.org/resource/Budesonide … örtlichen Behandlung von Asthma bronchiale, ... http://dbpedia.org/resource/Salbutamol … Bronchospasmolytikum bei Asthma bronchiale … … …
SPARQL in a nutshell Value Tests ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell More Sophisticated Graph Patterns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell Optional Graph Patterns ,[object Object],[object Object],[object Object],[object Object],?drug ?mp http://dbpedia.org/resource/Budesonide http://dbpedia.org/resource/Aciclovir 256.5 … …
SPARQL in a nutshell Matching alternatives with UNION ,[object Object],[object Object],[object Object],[object Object],dbpprop:metabolism dbpprop:excretion ?drug http://dbpedia.org/resource/Doripenem http://dbpedia.org/resource/Alprazolam http://dbpedia.org/resource/Piroxicam http://dbpedia.org/resource/Amlodipine …
SPARQL in a nutshell Defining the Dataset with the FROM clause ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],?label ?graph [email_address] http://dbpedia.org/resource/Propranolol
SPARQL in a nutshell A difficult to solve problem 1/3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell A difficult to solve problem 2/3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell A difficult to solve problem 3/3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell Result Forms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPARQL in a nutshell SPARQL Resources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],Querying the Semantic Web with SPARQL

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Querying the Semantic Web with SPARQL

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Notas del editor

  1. PREFIX skos: <http://www.w3.org/2004/02/skos/core#> PREFIX dbpedia: <http://dbpedia.org/resource/> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> PREFIX category: <http://dbpedia.org/resource/Category:> select ?s ?p where { ?s a dbpedia-owl:Drug ; skos:subject category:Anxiolytics ; ?p dbpedia:Kidney . } http://dbpedia.org/isparql/view/?query=PREFIX%20skos%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2004%2F02%2Fskos%2Fcore%23%3E%0APREFIX%20dbpedia%3A%20%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2F%3E%20%0APREFIX%20dbpedia-owl%3A%20%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%20%0APREFIX%20category%3A%20%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FCategory%3A%3E%20%0A%0Aselect%20%3Fs%20%3Fp%20%0Awhere%20%7B%20%3Fs%20a%20dbpedia-owl%3ADrug%20%3B%0A%20%20%20%20%20%20%20%20skos%3Asubject%20category%3AAnxiolytics%20%3B%0A%20%20%20%20%20%20%20%20%3Fp%20dbpedia%3AKidney%20.%20%7D%0A%20&endpoint=/sparql&maxrows=50&default-graph-uri=http://dbpedia.org