| Class | QueryState | Undocumented |
| Class | NumberQueryState | Create a new NumberQueryState object.
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| Class | StringQueryState | Create a new StringQueryState object.
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| Class | DateQueryState | Create a new DateQueryState object.
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| Class | DateIntervalQueryState | Create a new DateIntervalQueryState object.
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| Class | QueryExecuter | A QueryExecuter is responsible for taking the state (as in
QueryState)
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