Choices for spread control for fixed layout EPub.
    Static Properties
| Name | Description | 
|---|---|
| NO_SPREADS | No spreads. | 
| PHYSICAL_SPREADS | Physical spreads. | 
| SPREADS_BASED_ON_DOC | Spreads based on document. | 
| SYNTHETIC_SPREADS | Synthetic spreads. | 
| Name | Description | 
|---|---|
| NO_SPREADS | No spreads. | 
| PHYSICAL_SPREADS | Physical spreads. | 
| SPREADS_BASED_ON_DOC | Spreads based on document. | 
| SYNTHETIC_SPREADS | Synthetic spreads. |