1.5.13. How Can I define graph with virt:rdf_sponger option set to "on"?

Suppose we have the following scenario:

  1. Create Virtuoso user using Conductor for ex. with name "john" and pwd 1.

  2. Create for the user a RDF Sink folder for ex. with name "MySinkFolder" from type "RDF Upload Folder" or use the


    folder created automatically for your user.

  3. In the properties page of the RDF sink folder add in the WebDAV section this property


    with value:

    -- So in our example it should be:
  4. Add another property virt:rdf_sponger with value "on".

    Figure 1.2. 

  5. Upload RDF files to the RDF Sink folder "MySinkFolder", for ex. upload file with name "data.rdf":

    Figure 1.3. 

  6. As result the RDF data should be stored in graph depending on your folder name etc.:

    -- So in our example it will be:
    1. Go to http://host:port/sparql ;

    2. Execute simple query to view the graph triples:

      SELECT  *
      FROM <http://local.virt/DAV/home/john/MySinkFolder/data.rdf>
          ?s ?p ?o

      Figure 1.4. 

      Figure 1.5. 

  7. In order to define any graph you want with the options from above, you should execute:

    SQL> DAV_PROP_SET ('/DAV/home/<user-name>/<rdf-sink-folder>/',  'virt:rdf_graph', iri, <user-name>, <password>);
    -- So in our example it should be:
    SQL> DAV_PROP_SET ('/DAV/home/john/MySinkFolder/',  'virt:rdf_graph', 'http://mydata.com', 'john', '1');
    • Note: calling this function uses the given IRI as the graph IRI when sponging stuff put in <your-rdf-sink-folder>.

  8. Finally you should execute the following command to get the RDF data from the new graph:

    SQL> SELECT DAV_PROP_GET ('/DAV/home/<user-name>/<your-rdf-sink-folder>/', 'virt:rdf_graph',<user-name>, <password>);
    -- So in our example it should be:
    SQL> SELECT DAV_PROP_GET ('/DAV/home/john/MySinkFolder/', 'virt:rdf_graph','john', '1');
    Query result:
    No. of rows in result: 1