Optimizing Regular Path Expressions Using Graph Schemas

  title={Optimizing Regular Path Expressions Using Graph Schemas},
  author={Mary F. Fern{\'a}ndez and Dan Suciu},
Several languages, such as LOREL and UnQL, support querying of semi-structured data. Others, such as WebSQL and WebLog, query Web sites. All these languages model data as labeled graphs and use regular path expressions to express queries that traverse arbitrary paths in graphs. Naive execution of path expressions is ineecient, however, because it often requires exhaustive graph search. We describe two optimization techniques for queries with regular path expressions, which we call regular… CONTINUE READING
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