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Set Standard Prefix Names for common vocabularies

In order to set standard prefix names for common vocabularies on dumps to either .n3 or .ttl, you should use the xml_set_ns_decl Virtuoso function.

The initial list of namespace declarations can be found by executing from iSQL or Conductor UI:

SQL> SELECT * FROM DB.DBA.SYS_XML_PERSISTENT_NS_DECL;

Example

  1. Load the ontology, for ex.:

    SQL> DB.DBA.RDF_LOAD_RDFXML (http_get('http://lod.taxonconcept.org/ontology/txn.owl'), '', 'http://lod.taxonconcept.org/ontology/txn.owl#'); Done. -- 109 msec.

  2. Check total triples retrieved:

    SQL>SPARQL SELECT COUNT(*) from <http://lod.taxonconcept.org/ontology/txn.owl#> WHERE {?s ?p ?o}; callret-0 INTEGER _______________________________________________________________________________ 495 1 Rows. -- 16 msec.

  3. Register the XML NS prefix:

    SQL>DB.DBA.XML_SET_NS_DECL ('txn', 'http://lod.taxonconcept.org/ontology/txn.owl#', 2); Done. -- 0 msec.

  4. Use the prefix, for ex. executing:

    SQL>SPARQL SELECT COUNT(*) WHERE { ?s ?p txn:SpeciesConcept }; callret-0 INTEGER _______________________________________________________________________________ 25 1 Rows. -- 0 msec.

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