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    • Efficient Handling of SPARQL OPTIONAL for OBDA 

      Xiao G; Kontchakov R; Cogrel B; Calvanese D; Botoeva E (Springer, 2018)
      OPTIONAL is a key feature in SPARQL for dealing with missing information. While this operator is used extensively, it is also known for its complexity, which can make it a challenge to evaluate queries with OPTIONAL ...