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XSPARQL compliance test suite

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# bindings with two variables and two sets of values

prefix :  
prefix foaf:  

{for $s $o1 $o2
from  where{
  $s $p1 $o1 
  optional { service  {$s foaf:knows $o2 }}
} values $o2 {
 :b
}
return 
 
	{$o2}
	{$o1}
	{$s}
}