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author atsuko
date Thu, 25 Aug 2011 22:14:55 -0400
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# No DOT between non-triples patterns
PREFIX : <http://example.org/ns#> 
SELECT *
{ ?a :b :c 
  OPTIONAL{:x :y :z} 
  { :x1 :y1 :z1 } UNION { :x2 :y2 :z2 }
}