Virtuoso Open-Source Edition: ODS.ODSSKOSRefExampleBookmarks

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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 * 
WHERE 
  {
    ?forum a sioct:SubscriptionList .
    ?forum sioc:parent_of ?parentf .
    ?parentf sioc:container_of ?post.
    optional { ?post sioc:topic ?topic }  .
    optional { ?topic rdf:type skos:Concept  } .
    optional { ?topic skos:prefLabel ?tag }
  }
Sample Data (Live Query Results)
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