Modeling and Querying Semi-Structured data

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\begin{bibtex} @article{DBLP:journals/nis/CalvaneseGL99,

 author    = {Diego Calvanese and
              Giuseppe De Giacomo and
              Maurizio Lenzerini},
 title     = {Modeling and Querying Semi-Structured data },
 journal   = {Networking and Information Systems},
 volume    = {2},
 number    = {2},
 year      = {1999},
 pages     = {253-273},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}