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Jess (programming language)
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<p>Jess is a <a href="/facts/Rule_engine/3mem1gI0">rule engine</a> for the <a href="/facts/Java_(software_platform)/fpn6x8WL">Java</a> <a href="/facts/Computing_platform/DmKwp5Bk">computing platform</a>, written in the <a href="/facts/Java_(programming_language)/9ScgFyAL">Java</a> <a href="/facts/Programming_language/cWTYbgWa">programming language</a>. It was developed by <a href="/facts/Ernest_Friedman-Hill/X88J8N0F">Ernest Friedman-Hill</a> of <a href="/facts/Sandia_National_Laboratories/LYsKDj45">Sandia National Laboratories</a>. It is a <a href="/facts/Superset/SJGERmbA">superset</a> of the <a href="/facts/CLIPS/5Sek388z">CLIPS</a> language. It was first written in late 1995. The language provides <a href="/facts/Rule-based_programming/Xgh8lj3F">rule-based programming</a> for the automation of an <a href="/facts/Expert_system/CUCzSEaX">expert system</a>, and is often termed as an <i>expert system shell</i>. In recent years, <a href="/facts/Intelligent_agent/8C2Q93Vw">intelligent agent</a> systems have also developed, which depend on a similar ability. </p><p>Rather than a <a href="/facts/Imperative_programming/6b5dUnE1">procedural paradigm</a>, where one program has a <a href="/facts/Loop_(computing)/2XTDfErC">loop</a> that is activated only one time, the <a href="/facts/Declarative_programming/gogtdzcJ">declarative paradigm</a> used by Jess applies a set of rules to a set of facts continuously by a process named <i><a href="/facts/Pattern_matching/CEwptMs9">pattern matching</a></i>. Rules can modify the set of facts, or can execute any Java code. It uses the <a href="/facts/Rete_algorithm/Uw85WXLm">Rete algorithm</a> to execute rules. </p>