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<?xml version="1.0"?>
<book>
<title>Data on the Web</title>
<author>Serge Abiteboul</author>
<author>Peter Buneman</author>
<author>Dan Suciu</author>
<section id="intro" difficulty="easy" >
<title>Introduction</title>
<p>Text ... </p>
<section>
<title>Audience</title>
<p>Text ... </p>
</section>
<section>
<title>Web Data and the Two Cultures</title>
<p>Text ... </p>
<figure height="400" width="400">
<title>Traditional client/server architecture</title>
<image source="csarch.gif"/>
</figure>
<p>Text ... </p>
</section>
</section>
<section id="syntax" difficulty="medium" >
<title>A Syntax For Data</title>
<p>Text ... </p>
<figure height="200" width="500">
<title>Graph representations of structures</title>
<image source="graphs.gif"/>
</figure>
<p>Text ... </p>
<section>
<title>Base Types</title>
<p>Text ... </p>
</section>
<section>
<title>Representing Relational Databases</title>
<p>Text ... </p>
<figure height="250" width="400">
<title>Examples of Relations</title>
<image source="relations.gif"/>
</figure>
</section>
<section>
<title>Representing Object Databases</title>
<p>Text ... </p>
</section>
</section>
</book>
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