book

Learning SPARQL, 2nd Edition

by Bob DuCharme

July 2013

Beginner

386 pages

10h 33m

English

O'Reilly Media, Inc.

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Why Learn SPARQL?Organization of This BookConventions Used in This BookDocumentation ConventionsUsing Code ExamplesSafari® Books OnlineHow to Contact UsAcknowledgments
The Data to QueryQuerying the DataMore Realistic Data and Matching on Multiple TriplesSearching for StringsWhat Could Go Wrong?Querying a Public Data SourceSummary
What Exactly Is the “Semantic Web”?URLs, URIs, IRIs, and NamespacesThe Resource Description Framework (RDF)Storing RDF in FilesStoring RDF in DatabasesData TypingMaking RDF More Readable with Language Tags and LabelsBlank Nodes and Why They’re UsefulNamed GraphsReusing and Creating Vocabularies: RDF Schema and OWLLinked DataSPARQL’s Past, Present, and FutureThe SPARQL SpecificationsSummary
More Readable Query ResultsUsing the Labels Provided by DBpediaGetting Labels from Schemas and OntologiesData That Might Not Be ThereFinding Data That Doesn’t Meet Certain ConditionsSearching Further in the DataSearching with Blank NodesEliminating Redundant OutputCombining Different Search ConditionsFILTERing Data Based on ConditionsRetrieving a Specific Number of ResultsQuerying Named GraphsQueries in Your QueriesCombining Values and Assigning Values to VariablesCreating Tables of Values in Your QueriesSorting, Aggregating, Finding the Biggest and Smallest and...Sorting DataFinding the Smallest, the Biggest, the Count, the Average...Grouping Data and Finding Aggregate Values within GroupsQuerying a Remote SPARQL ServiceFederated Queries: Searching Multiple Datasets with One QuerySummary
Query Forms: SELECT, DESCRIBE, ASK, and CONSTRUCTCopying DataCreating New DataConverting DataFinding Bad DataDefining Rules with SPARQLGenerating Data About Broken RulesUsing Existing SPARQL Rules VocabulariesAsking for a Description of a ResourceSummary
Datatypes and QueriesRepresenting StringsComparing Values and Doing ArithmeticFunctionsProgram Logic FunctionsNode Type and Datatype Checking FunctionsNode Type Conversion FunctionsDatatype ConversionChecking, Adding, and Removing Spoken Language TagsString FunctionsNumeric FunctionsDate and Time FunctionsHash FunctionsExtension FunctionsSummary
Getting Started with FusekiAdding Data to a DatasetDeleting DataChanging Existing DataNamed GraphsDropping GraphsNamed Graph Syntax Shortcuts: WITH and USINGCopying and Moving Entire GraphsDeleting and Replacing Triples in Named GraphsSummary
Efficiency Inside the WHERE ClauseReduce the Search SpaceOPTIONAL Is Very OptionalTriple Pattern Order MattersFILTERs: Where and WhatProperty Paths Can Be ExpensiveEfficiency Outside the WHERE ClauseDebuggingManual DebuggingSPARQL AlgebraDebugging ToolsSummary

SPARQL Query Results XML FormatProcessing XML Query ResultsSPARQL Query Results JSON FormatProcessing JSON Query ResultsSPARQL Query Results CSV and TSV FormatsUsing CSV Query ResultsTSV Query ResultsSummary
What Is Inferencing?Inferred Triples and Your QueryMore than RDFS, Less than Full OWLSPARQL and RDFS InferencingSPARQL and OWL InferencingUsing SPARQL to Do Your InferencingQuerying SchemasSummary
Applications and TriplesProperty FunctionsModel-Driven DevelopmentSPARQL and Web Application DevelopmentSPARQL ProcessorsStandalone ProcessorsTriplestore SPARQL SupportMiddleware SPARQL SupportPublic Endpoints, Private EndpointsSPARQL and HTTPGET a Graph of TriplesPUT a Graph of TriplesPOST a Graph of TriplesDELETE a Graph of TriplesSummary
Themes and VariationsExploring the DataHow Do I Look at All the Data at Once?ProblemSolutionDiscussionSee AlsoWhat Classes Are Declared?ProblemSolutionDiscussionSee AlsoWhat Properties Are Declared?ProblemSolutionDiscussionSee AlsoWhich Classes Have Instances?ProblemSolutionDiscussionSee AlsoWhat Properties Are Used?ProblemSolutionDiscussionSee AlsoWhich Classes Use a Particular Property?ProblemSolutionDiscussionSee AlsoHow Much Was a Given Property Used?ProblemSolutionDiscussionSee AlsoHow Much Was a Given Class Used?ProblemSolutionDiscussionSee AlsoA Given Class Has Lots of Instances. What Are These Things?ProblemSolutionDiscussionSee AlsoWhat Data Is Stored About a Class’s Instances?ProblemSolutionDiscussionSee AlsoWhat Values Does a Given Property Have?ProblemSolutionDiscussionSee AlsoA Certain Property’s Values Are Resources. What Data Do We Have About Them?ProblemSolutionDiscussionSee AlsoHow Do I Find Undeclared Properties?ProblemSolutionDiscussionSee AlsoHow Do I Treat a URI as a String?ProblemSolutionDiscussionSee AlsoWhich Data or Property Name Includes a Certain Substring?ProblemSolutionDiscussionSee AlsoHow Do I Convert a String to a URI?ProblemSolutionDiscussionSee AlsoHow Do I Query a Remote Endpoint?ProblemSolutionDiscussionSee AlsoHow Do I Retrieve Triples from a Remote Endpoint?ProblemSolutionDiscussionSee AlsoCreating and Updating DataHow Do I Delete All the Data?ProblemSolutionDiscussionSee AlsoHow Do I Globally Replace a Property Value?ProblemSolutionDiscussionSee AlsoHow Do I Replace One Property with Another?ProblemSolutionDiscussionSee AlsoHow Do I Change the Datatype of a Certain Property’s Values?ProblemSolutionDiscussionSee AlsoHow Do I Turn Resources into Instances of Declared Classes?ProblemSolutionDiscussionSee AlsoSummary

Overview

Gain hands-on experience with SPARQL, the RDF query language that’s bringing new possibilities to semantic web, linked data, and big data projects. This updated and expanded edition shows you how to use SPARQL 1.1 with a variety of tools to retrieve, manipulate, and federate data from the public web as well as from private sources.

Author Bob DuCharme has you writing simple queries right away before providing background on how SPARQL fits into RDF technologies. Using short examples that you can run yourself with open source software, you’ll learn how to update, add to, and delete data in RDF datasets.