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          Datatype object. | 
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          Creates a user-defined type by adding parameters to the pre-defined type. | 
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          Signals Datatype related exceptions. | 
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          A Datatype library | 
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          Factory class for the DatatypeLibrary class. | 
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          Datatype streaming validator. | 
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          An interface that must be implemented by caller to provide context information that is necessary to perform validation of some Datatypes. |