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Structurally recursive XML queries are an important query class that follows the structure of XML data. At present, it is difficult for XQuery to type and optimize structurally recursive queries because of polymorphic recursive functions involved in the queries.doi:10.1016/b978-155860869-6/50016-0 dblp:conf/vldb/ParkMC02 fatcat:4uewkevcbvbfjp2erelsr7do6y