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Prefuse is a set of software tools for creating rich interactive data visualizations in the Java programming language.

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Classes implementing an SQL-like expression language for filtering and manipulating data.
The base type of the language, {@link prefuse.data.expression.Expression}, represents a 
calculation over a single
tuple at a time. Expressions can be created programatically by instantiating
the desired classes of this package, or can be compiled from a textual
language with a SQL-like syntax by the
{@link prefuse.data.expression.parser.ExpressionParser} class.