| IActionableItem | An active item has an item identifier. |
| IGenericDocument | Base interface for document types that may be returned by a IUnitFormatter. |
| IItem | Base interface for output items. |
| IUnitDocumentPresentation | This class holds a unit document and presentation elements for that document. |
| IUnitFormatter | A unit formatter is used to retrieve presentations of a unit. |
| IVisualItem | Visual items are used to attach class information to items. |
| AbstractTransientUnitRepresentation | |
| AbstractUnitRepresentation | A skeleton class for unit document presentations. |
| UnitFormatterAdapter | Standard implementation of a unit formatter. |
| UnitFormatterUtil | Utility methods for unit formatters. |
| UnitItemIdGenerator | Generate unique item IDs for objects managed by units. |
| UnitRepresentationAdapter | A simple unit representation, always returning the document set provided at construction time. |
| ItemClassIdentifiers | Well-known class identifiers for interactive items. |