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XSPARQL compliance test suite

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prefix  foaf:   

{for $person $nick $page $img $name $firstn
from  where{ 
    $person foaf:nick $nick
    optional { $person foaf:isprimarytopicof $page } 
    optional { 
        $person foaf:name $name 
        { $person foaf:depiction $img } union 
        { $person foaf:firstname $firstn } 
    } filter ( bound($page) || bound($img) || bound($firstn) ) 
} 
return 
 
	{$firstn}
	{$person}
	{$nick}
	{$page}
	{$name}
	{$img}
}