Che, DunrenAberer, KarlOzsu, Tamer2007-01-272007-01-272007-01-27200610.1007/s00778-005-0172-6https://infoscience.epfl.ch/handle/20.500.14299/240036WOS:0002385255000058864Query Optimization in XML Structured Document Databasestext::journal::journal article::research article