# Package org.pentaho.reporting.libraries.formula.function

- Interface Summary
  Interface | Description
  --- | ---
  Function | A function is an arbitary computation.
  FunctionCategory | Creation-Date: 05.11.2006, 14:24:20
  FunctionDescription | A static definition of the function's parameters, return values etc.
  FunctionRegistry | The function registry contains all information about all function available.
  ParameterCallback | Creation-Date: 13.11.2006, 13:52:21

- Class Summary
  Class | Description
  --- | ---
  AbstractFunctionCategory | Creation-Date: 05.11.2006, 14:31:22
  AbstractFunctionDescription | Creation-Date: 04.11.2006, 18:30:33
  DefaultFunctionDescription | Creation-Date: 05.11.2006, 15:13:03
  DefaultFunctionRegistry | Creation-Date: 02.11.2006, 12:48:32
  InvalidFunctionCategory | This category is used when a problem occured while loading a function metadata category.