iSPARQL Querying Tutorial with SPARQL Query type "DESCRIBE".

In this tutorial we will show how to execute a SPARQL query with type "DESCRIBE".

Enter a query and execute

1. Go to iSPARQL demo page.
2. Click "Ok" in the shown Login form. By default should be shown user name demo and password demo.
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3. As result will be shown the iSPARQL home page, with opened tab "QBE" and default graph elements will be shown on the Canvas. Click the "Clear Pane" icon form the toolbar in order to empty the Canvas.
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4. From the Schemas window click the down-arrow and from the list select the schema with URL: http://rdfs.org/sioct/types# and click the "Import" button.
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5. As result in the Schemas window under "unbound" will appear new item sioct. Click its "+" icon in order to expand it.
6. Click the "+" icon for the sub-item Concepts.
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7. Now scroll down the shown list and drag-and-drop the Subject Node "Weblog" on to the QBE Canvas.
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8. Select the empty node and fill in the Node window for field "Variable" the value: ?forum
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9. Change the "Data Source URI" field value from the QBE tab to: http://demo.openlinksw.com/dataspace as this is the Graph for the database against which we are going to execute our SPARQL Query.
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10. From the QBE tab do the following changes:
    1. Select for "Type": DESCRIBE.
    2. Select value 10 for "Max Rows".
    3. From the drop-down list with selected by default value "Get Remote Data when Missing Locally" select the item Get Local Data Only.
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11. Click the "Run Query" button from the QBE toolbar.
12. As result will be opened the Results tab showing in a RDF/XML format the results of executing our SPARQL Query with type "DESCRIBE".
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13. In order to view the produced SPARQL query, click the "Load Query to Advanced" button.
    • Note: you can view the produced SPARQL Query also from the QBE tab by clicking the "Generate" button from the QBE toolbar.
14. As result will be open the Advanced tab and in the SPARQL Query text-area will be shown the produced SPARQL query with type "DESCRIBE".
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References

• Virtuoso Documentation SPARQL Query examples