@inproceedings{ the02, crossref = {sigmod2002}, author = {Anja Theobald and Gerhard Weikum}, title = {The XXL Search Engine: Ranked Retrieval of XML Data Using Indexes and Ontologies}, topic = {xxl[1]}, uri = {http://www-dbs.cs.uni-sb.de/papers/sources/2002/tw00-sigmod02.pdf} }