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\def\mowgli{{\sc MoWGLI}}

\title{A complex use case for XML-technology:\\
\small{The European Project IST-2001-33562 MoWGLI}}
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\begin{abstract}
The following paper contains the results of an extensive validation
of XML-technology conducted during the last three years in the framework
of the European Project IST-2001-33562 \mowgli. 
\end{abstract}

\section{Introduction}
The European Project IST-2001-33562 \mowgli, activated in march 2002 and
lasting three years, aimed at the exploitation of semantic based 
techniques for mathematical knowledge management\cite{mkm03,mkm04}, 
with particular
emphasis on {\em web publishing}, {\em transformation} and {\em 
searching and retrieving} issues. \mowgli was based on an 
extensive use of XML-technology, aiming both at providing a
major XML test-bench and at becoming an example of best-practice in its
use. 

To grasp the dimension of the validation, we managed a 
repository of $tot$ fully structured xml-documents\footnote{Each document is
piece of formal mathematics (a definition or a theorem), exported
from the library of a well-known tool for the automatic support to formal
reasoning: the Coq proof assistant} of very different sizes,
spanning from very few elements to $tot$ gigabytes (for a total of
$tot$ gigabytes). We wrote 13951 lines of XSLT (39 stylesheets) 
plus $13398$ additional lines ($21$ stylesheets) which are 
{\em automatically generated} 
starting from a very high-level
xml description of mathematical notation\footnote{We also reused 
a stylesheet transforming MathML content to
MathML presentation (4007 lines) developed at \dots.}. Each document
in the repository has an associated RDF file mostly modeling, in addition
to traditional Dublin-Core metadata, dependendy relations among the
objects in the repository. This kind of metadata are automatically 
computed from the structured description of the object, and extensively
used to improve both searching and browsing functionality (e.g. providing
graphical descriptions of the dependency relations among the object in
the repository).

A lot of different tools have been tested during the development of
the project covering most aspects of XML-technology.
Our validation effort provided valuable feedback to many developers
of these tools,  both in the form of bug reports (abbiamo idea di quanti
bug reports abbiamo redatto e della loro classificazionI? quanti cioe'
gravi?) and suggestions for improvement (especially in performance).

We also actively contributed to software development. In particular,
let us mention the implementation of Gdome2 \cite{Gdome2}, a level2 
compliant DOM api written in C++ for the gnome programming environment, 
that was mostly performed and tuned within the framework of the 
\mowgli project, and GtkMathView (\cite{}), a rendering widget for 
MathML.

Summing up, \mowgli has been a very intense project, explicitly aimed 
to {\em stress} XML-technology up to its very limit (and possibly a 
little beyond, as in the case of stylesheets). The following paper
is just a report of our experience. 

Cenni sulla struttura del paper? Vediamo alla fine.


\section{The repository}
Un po di dati sulla libreria dimensione minima, media max dei files,
idem per profondita' e larghezza. 
Cenni sul DTD? Spiegare se/perche' non abbiamo mai sentito bisogno
di una schema?



\begin{thebibliography}{}
\bibitem{mkm03}A.Asperti, B.Buchberger, J.Davenport (eds). 
Proceedings of the Second International Conference on Mathematical
Knowledge Management, MKM 2003. Bertinoro, Italy. LNCS, 2594.
\bibitem{mkm04}A.Asperti, G.Bancerek, A.Trybulec (eds). 
Proceeding of the Third International Conference on
Mathematical Knowledge Management, MKM 2004. Bialowieza, Poland. LNCS 3119.
\bibitem{Gdome2} P. Casarini, L.Padovani. The Gnome DOM Engine. 
Markup Languages: Theory \& Practice, Vol. 3, Issue 2, pp. 173--190, 
ISSN 1099-6621, MIT Press, April 2002. 
\end{thebibliography}


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