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myExperiment Logo How To SPARQL

Contents

  1. Using the SPARQL Endpoint
    1. Automated Querying
  2. PREFIX
    1. BASE
  3. SELECT
  4. WHERE
    1. UNION
    2. OPTIONAL
  5. FILTER
    1. On Text
    2. On Numbers
    3. On Dates
  6. ORDER BY
  7. LIMIT
    1. OFFSET
  8. Troubleshooting
    1. Syntax Errors
    2. Complexity Warnings
    3. Parser Warnings

myExperiment's SPARQL endpoint allows anyone to query all of myExperiment's public data using the query language SPARQL.

Although SPARQL is quite easy to use it may take a while to get you head round it if you are coming to it new and you are not from a computer science background. This guide is intended to help explain the basics of SPARQL and give usable examples that will return actual results from myExperiment's SPARQL endpoint, which can be compared against example results. Although it should be noted that example results are intended as a guide to the format of results and will probably not be exactly the same as those returned by the SPARQL endpoint.

The first section explains how to use the SPARQL endpoint and the unique features the myExperiment SPARQL endpoint has.

Sections 2-7 explain the main clauses used within SPARQL and how they are used to define queries.

Section 8 give some explanation of various warning and error messages you might be prompted with and how to fix you query to eliminate these.


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