Queries and Constraints on Semi-structured Data

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\begin{bibtex} @inproceedings{DBLP:conf/caise/CalvaneseGL99,

 author    = {Diego Calvanese and
              Giuseppe De Giacomo and
              Maurizio Lenzerini},
 title     = {Queries and Constraints on Semi-structured Data},
 booktitle = {CAiSE},
 year      = {1999},
 pages     = {434-438},
 ee        = {http://link.springer.de/link/service/series/0558/bibs/1626/16260434.htm},
 crossref  = {DBLP:conf/caise/1999},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}