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Provides a framework for rule based text scanning
and uses the framework to provide rule-driven default implementations of
<tt>IPresentationDamager</tt>, <tt>IPresentationRepairer</tt> and <tt>IDocumentPartitioner</tt>.
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Package Specification</h2>
<tt>RuleBasedScanner</tt> is a document-based scanner controlled by <tt>IRule</tt>
objects. When evaluated an <tt>IRule</tt> always returns an <tt>IToken</tt>.
The package provides a set of rules whereby <tt>PatternRule</tt> is the
most important one. <tt>PatternRule</tt> defines a pattern-configurable
rule.
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