---+++Addressbook Applications Data Space 
<verbatim>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX atom: <http://atomowl.org/ontologies/atomrdf#>
PREFIX sioc: <http://rdfs.org/sioc/ns#>
PREFIX sioct: <http://rdfs.org/sioc/types#>
SELECT DISTINCT ?title, ?link, ?upd, ?aut, ?pub, ?sour 
WHERE 
  {
    ?forum rdf:type sioct:AddressBook .
    ?forum sioc:container_of ?post.
    optional { ?post atom:title ?title } .
    optional { ?post atom:link ?link } .        
    optional { ?post atom:updated ?upd } .        
    optional { ?post atom:author ?aut } .
    optional { ?post atom:published ?pub } .
    optional { ?post atom:source ?sour } .
  }
</verbatim>

---+++++Sample Data (Live Query Results)
   * Click [[http://demo.openlinksw.com/sparql?default-graph-uri=http%3A%2F%2Fdemo.openlinksw.com%2Fdataspace&should-sponge=&query=PREFIX+rdf%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23%3E%0D%0APREFIX+atom%3A+%3Chttp%3A%2F%2Fatomowl.org%2Fontologies%2Fatomrdf%23%3E%0D%0APREFIX+sioc%3A+%3Chttp%3A%2F%2Frdfs.org%2Fsioc%2Fns%23%3E%0D%0APREFIX+sioct%3A+%3Chttp%3A%2F%2Frdfs.org%2Fsioc%2Ftypes%23%3E%0D%0ASELECT+DISTINCT+%3Ftitle%2C+%3Flink%2C+%3Fupd%2C+%3Faut%2C+%3Fpub%2C+%3Fsour+%0D%0AWHERE+%0D%0A++%7B%0D%0A++++%3Fforum+rdf%3Atype+sioct%3AAddressBook+.%0D%0A++++%3Fforum+sioc%3Acontainer_of+%3Fpost.%0D%0A++++optional+%7B+%3Fpost+atom%3Atitle+%3Ftitle+%7D+.%0D%0A++++optional+%7B+%3Fpost+atom%3Alink+%3Flink+%7D+.++++++++%0D%0A++++optional+%7B+%3Fpost+atom%3Aupdated+%3Fupd+%7D+.++++++++%0D%0A++++optional+%7B+%3Fpost+atom%3Aauthor+%3Faut+%7D+.%0D%0A++++optional+%7B+%3Fpost+atom%3Apublished+%3Fpub+%7D+.%0D%0A++++optional+%7B+%3Fpost+atom%3Asource+%3Fsour+%7D+.%0D%0A++%7D&format=text%2Fhtml][Here]] for a live SPARQL Query (via SPARQL Protocol) against a collection of AddressBook posts.