List of Containers(Sections) and foaf:Documents(Tutorials)

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>  
PREFIX sioc: <http://rdfs.org/sioc/ns#> 
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT DISTINCT ?forum_name, ?title, ?post as ?url, ?created_at, ?description
WHERE
  { 
    ?forum rdf:type "Tutorial".
    ?forum sioc:description ?forum_name.
    ?forum sioc:container_of ?post. 
    ?post rdf:type foaf:Document.
    OPTIONAL { ?post dc:title ?title } .
    OPTIONAL { ?post dcterms:created_at ?created_at } .
    OPTIONAL { ?post sioc:description ?description } .
  }

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