| IKnownIssueWarningInfo | Represents a warning about known issue which won’t be fixed in the near future. |
| INotImplementedWarningInfo | Represents a warning about known not implemented feature which won’t be implemented in the near future. |
| IObsoletePresLockingBehaviorWarningInfo | This warning indicates that an obsolete presentation locking behavior is used. |
| IPresentationSignedWarningInfo | This warning indicates that the presentation being read has the signature and this signature will be removed during processing. |
| IWarningCallback | Interface for classes which receive warning |
| IWarningInfo | Represents a base interface for all warnings. |