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XSPARQL compliance test suite

The newest version!

(: List the number of publications the co-authors of Axel Polleres share between them 
   This is currently restricted to publications Axel is an author :)

prefix foaf: 
prefix dc:      

(: $ds will contain all the authors that co-author publications with Axel Polleres :)
let $ds := for * from 
           where { $pub dc:creator [] }
           construct {
                      { for * from $pub where { $p dc:creator $o . }
                        construct { $p dc:creator $o } } 
           }

(: allauthors contains the distinct authors :)
let $allauthors := distinct-values(
                      for $o from $ds where {$p dc:creator $o}
                      order by $o
                      return $o
                   )

for $auth at $auth_pos in $allauthors
 for $coauth in $allauthors[position() > $auth_pos]
    let $commonPubs := count(
     { for $pub from $ds where { $pub dc:creator $auth, $coauth } return $pub }
    )
where ($commonPubs > 0)
construct { [ :author1 $auth; :author2 $coauth; :commonPubs $commonPubs ] }