| Interface | Description | 
|---|---|
| SpaceDocumentColumnFamilyMapper | An interface for mapping types to column families and for mapping space documents to column
 family rows. | 
| Class | Description | 
|---|---|
| DefaultSpaceDocumentColumnFamilyMapper | The default  SpaceDocumentColumnFamilyMapperimplementation. | 
| SpaceTypeDescriptorHolder | A  SpaceTypeDescriptorholder which serializes/deserializes its underlyingSpaceTypeDescriptorIn a version compatible manner. | 
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