@inproceedings{SIGMOD-2002-TheobaldW,
	author        = "Anja Theobald and Gerhard Weikum",
	booktitle     = "{Proceedings of the 20th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/564691.564768",
	isbn          = "1-58113-497-5",
	pages         = "615",
	publisher     = "{ACM}",
	title         = "{The XXL search engine: ranked retrieval of XML data using indexes and ontologies}",
	year          = 2002,
}