| Interface | Description | 
|---|---|
| CasData | Interface for directly accessing and manipulating the data in the Common Analysis Structure. | 
| FeatureStructure | An object in the CAS. | 
| FeatureValue | The base interface for the value of a feature. | 
| PrimitiveArrayFS | A subtype of FeatureStructure that represents an array of primitive values (Strings, int, or
 floats). | 
| PrimitiveValue | Represents a primitive feature value - a string, integer, or float. | 
| ReferenceArrayFS | A subtype of FeatureStructure that represents an array of primitive values (Strings, int, or
 floats). | 
| ReferenceValue | A FeatureValue that represents a reference, via ID, to another FeatureStructure. | 
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