# Filter.h File Reference

`#include <FdoStd.h>`
`#include <Fdo/Filter/BinaryLogicalOperations.h>`
`#include <Fdo/Commands/IdentifierCollection.h>`

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## Classes
class | FdoFilter
| The FdoFilter abstract class is a base class for condition and operator classes that can occur in a filter expression tree. The FdoFilter class contains operations for converting between the text and expression tree representation of a filter. More...