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# Class Group

All classes belong to the class group. The subset of classes beloging to same class group has similar interfaces.

`Allocator class group`
  Dynamic allocated memory operation class. The class belong to the allocator class group operate one or more memory objects which allocated dynamically. The class in this group is used by set class group etc ...
`Math class group`
  Mathematical operation of objects and expression object handling class.
`TextForm class group`
  Formatter classes for plain text data. The TextForm class group supports indentation of text.
`XML class group`