is.bbl
\newcommand{\SortNoOp}[1]{}
\begin{thebibliography}{10}

\bibitem{ABS2000}
S.~Abiteboul, P.~Buneman, and D.~Suciu.
\newblock {\em {Data on the Web}}.
\newblock Morgan Kaufmann Publishers, 2000.

\bibitem{AV99}
S.~Abiteboul and V.~Vianu.
\newblock {Regular Path Queries with Constraints}.
\newblock {\em Journal of Computer and System Sciences}, {\bf 58}(3):428--452,
  1999.

\bibitem{AM98}
G.~Arocena and A.~Mendelzon.
\newblock {``WebOQL: Restructuring Documents, Databases, and Webs''}.
\newblock In {\em Proceedings of the 14th IEEE International Conference on Data
  Engineering (ICDE)}, Orlando, Florida, USA, Feb. 1998.

\bibitem{AMM97}
G.~Arocena, A.~Mendelzon, and G.~Mihaila.
\newblock {``Applications of a Web Query Language''}.
\newblock In {\em Proceedings of the 6th International WWW Conference}, Santa
  Clara, California, USA, Apr. 1997.

\bibitem{AM97}
P.~Atzeni and G.~Mecca.
\newblock {``Cut and Paste''}.
\newblock In {\em Proceedings of the 16th ACM SIGACT-SIGMOD-SIGART Symposium on
  Principles of Database Systems (PODS'97)}, Tucson, AZ USA, 1997.

\bibitem{Aza2001}
F.~Azavant.
\newblock Personal communication, Oct. 2001.

\bibitem{BFG2001b}
R.~Baumgartner, S.~Flesca, and G.~Gottlob.
\newblock {``Declarative Information Extraction, Web Crawling, and Recursive
  Wrapping with Lixto''}.
\newblock In {\em Proc. LPNMR'01}, Vienna, Austria, 2001.

\bibitem{BFG2001a}
R.~Baumgartner, S.~Flesca, and G.~Gottlob.
\newblock {``Visual Web Information Extraction with Lixto''}.
\newblock In {\em Proceedings of the 27th International Conference on Very
  Large Data Bases (VLDB'01)}, 2001.

\bibitem{Wadler99}
M.~Fernandez, J.~Sim\'eon, P.~Wadler, S.~Cluet, A.~Deutsch, D.~F.~A. Levy,
  D.~Maier, J.~M.~J. Robie, D.~Suciu, and J.~Widom.
\newblock {``XML Query Languages: Experiences and Exemplars''}, 1999.
\newblock http://www-db.research.bell-labs.com/user/simeon/xquery.html.

\bibitem{GK2002}
G.~Gottlob and C.~Koch.
\newblock {``Monadic Datalog and the Expressive Power of Web Information
  Extraction Languages''}.
\newblock In {\em Proceedings of the 21st ACM SIGACT-SIGMOD-SIGART Symposium on
  Principles of Database Systems (PODS'02)}, pages 17--28, Madison, Wisconsin,
  2002.

\bibitem{GKJACM}
G.~Gottlob and C.~Koch.
\newblock {``Monadic Datalog and the Expressive Power of Web Information
  Extraction Languages''}.
\newblock {\em Journal of the ACM}, 2003.
\newblock to appear.

\bibitem{LRNS2002}
A.~H.~F. Laender, B.~Ribeiro-Neto, and A.~{S. da Silva}.
\newblock {``DEByE -- Data Extraction By Example''}.
\newblock {\em Data and Knowledge Engineering}, {\bf 40}(2):121--154, Feb.
  2002.

\bibitem{LSS96}
L.~V. Lakshmanan, F.~Sadri, and I.~N. Subramanian.
\newblock {``A Declarative Language for Querying and Restructuring the
  World-Wide-Web''}.
\newblock In {\em Workshop on Research Issues in Data Engineering
  (RIDE-NDS'96)}, New Orleans, USA, Feb. 1996.

\bibitem{LPH98}
L.~Liu, C.~Pu, and W.~Han.
\newblock {``XWRAP: An XML-Enabled Wrapper Construction System for Web
  Information Sources''}.
\newblock In {\em Proceedings of the 16th IEEE International Conference on Data
  Engineering (ICDE)}, pages 611--621, San Diego, USA, 2000.

\bibitem{LHLMS98}
B.~Lud\"ascher, R.~Himmer\"oder, G.~Lausen, W.~May, and C.~Schlepphorst.
\newblock {``Managing Semistructured Data with Florid: A Deductive
  Object-oriented Perspective''}.
\newblock {\em Information Systems}, {\bf 23}(8):1--25, 1998.

\bibitem{MMK98}
I.~Muslea, S.~Minton, and C.~Knoblock.
\newblock {``STALKER: Learning Extraction Rules for Semistructured, Web-based
  Information Sources''}.
\newblock In {\em Proceedings of the AAAI-98 Workshop on AI and Information
  Integration}. AAAI Press, Menlo Park, CA, 1998.

\bibitem{PGGMU95}
Y.~Papakonstantinou, A.~Gupta, H.~Garcia-Molina, and J.~Ullman.
\newblock {``A Query Translation Scheme for Rapid Implementation of
  Wrappers''}.
\newblock In {\em Proc. 4th International Conference on Deductive and
  Object-oriented Databases (DOOD'95)}, pages 161--186, Singapore, 1995.
  Springer.

\bibitem{SA2001}
A.~Sahuguet and F.~Azavant.
\newblock {``Building Intelligent Web Applications Using Lightweight
  Wrappers''}.
\newblock {\em Data and Knowledge Engineering}, {\bf 36}(3):283--316, 2001.

\bibitem{XPath1}
{World Wide Web Consortium}.
\newblock {XML Path Language (XPath) Recommendation.
  http://www.w3c.org/TR/xpath/}, Nov. 1999.

\end{thebibliography}
