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Assigning variables

If you want to construct RDF triples using a variable that is derived from retrieved data, e.g., through an arithmetical operation, you can add a BIND statement to the WHERE clause as follows:

PREFIX dbpedia: <>
PREFIX foaf: <>
PREFIX mo: <>

CONSTRUCT { ?track mo:runtime ?secs } 
WHERE { dbpedia:The_Beatles foaf:made ?album .
    ?album mo:record ?record .
    ?record mo:track ?track .
    ?track mo:duration ?duration .
    BIND ((?duration/1000) AS ?secs) .

In this way the object of mo:runtime will be given in seconds rather than milliseconds.

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This article is from the free online course:

Introduction to Linked Data and the Semantic Web

University of Southampton

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Find out what this course is like by previewing some of the course steps before you join:

  • Welcome to the course
    Welcome to the course

    Watch Dr Elena Simperl & Dr Barry Norton explain how this short course on linked data & the semantic web can help you use this technology in your work

  • Developing real world applications
    Developing real world applications

    Watch Dr Barry Norton describing some real world applications that have Linked Data as their underlying technology.

  • Welcome to Week 2
    Welcome to Week 2

    Watch Dr Barry Norton explain what you will learn about SPARQL (the query language) on this course and what you will be practicing.

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