Data Space Post/Entry/Item Properties (sioc:Post predicates)

   * content ( supported for file types: 'text/*');
   * has_container
   * has_creator
   * id
   * link
   * links_to ( supported for file types: 'text/html');
   * topic (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#>
SELECT distinct ?attribute
WHERE 
  {
    ?forum rdf:type sioct:Briefcase .
    ?forum sioc:container_of ?post .
    ?post ?attribute ?o  
  }
ORDER BY ?attribute