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 | <TO DO> Expression4j is a simple framework. It is splited into 3 part:
 
 
              This three components are regrouped into one factory (ExpressionFactory)the expression modelthe expression parser.the catalogand parameters Expression parser analyse the expression and construct the associated tree representation.
 Catalog store all necessary expression used to evaluate an expression.
 Parameters are used to give value on each parameter of an expression.
 
 The NumberFactory is used to generate mathematical element like real, complex ...
 
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