Part of lp.registry.interfaces
| Class | MilestoneNameField | A field that can get the milestone from different contexts. |
| Interface | IMilestoneData | Interface containing the data for milestones. |
| Interface | IAbstractMilestone | An intermediate interface for milestone, or a targeting point for bugs |
| Interface | IMilestoneSet | An set provides access `IMilestone`s. |
| Interface | ICanGetMilestonesDirectly | An interface for classes providing getMilestone(name). |