Virtuoso Open-Source Edition: ODS.ODSSKOSRefExampleBlog

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Weblog Post Tags

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX sioc: <http://rdfs.org/sioc/ns#>
PREFIX sioct: <http://rdfs.org/sioc/types#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
SELECT DISTINCT ?tag ?topic
WHERE
  {
    ?forum a sioct:Weblog .
    ?forum sioc:container_of ?post.
    OPTIONAL { ?post sioc:topic ?topic }.
    OPTIONAL { ?topic rdf:type skos:Concept }.
    OPTIONAL { ?topic skos:prefLabel ?tag }.
   }

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