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D3web
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<p>d3web is a free, open-source platform for <a href="/facts/Knowledge-based_systems/uocg0bY3">knowledge-based systems</a> (<a href="/facts/Expert_systems/CUCzSEaX">expert systems</a>). Its core is written in <a href="/facts/Java_(software_platform)/fpn6x8WL">Java</a> using <a href="/facts/XML/clNgUfWk">XML</a> and/or Office-based formats for the knowledge storage. All of its components are distributed under the terms of the Lesser General Public Licence (<a href="/facts/LGPL/AXwkz9x3">LGPL</a>). </p><p>The d3web diagnostic core implements reasoning and persistence components for problem-solving knowledge including <a href="/facts/Decision_trees/XDVeGlkJ">decision trees</a>, <a href="/facts/Production_system_(computer_science)/v8XkbgJJ">(heuristic) rules</a>, set-covering models and diagnostic flowcharts. The software can be integrated into foreign applications (embedded or OEM), but a number of off-the-shelf components already exist. </p>