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xsparql.testcases-dawg.data-r2.algebra.nested-opt-2.xsparql Maven / Gradle / Ivy

prefix :    

## the nested optional example, rewritten to a form that is the same
## for the sparql algebra and the declarative semantics.

{for *
from  where{ 
    :x1 :p $v .
    optional { :x3 :q $w }
    optional { :x3 :q $w  . :x2 :p $v }
}

return 
 
	{$w}
	{$v}
}