OSID - osid.course.plan.LessonAnchor Service Interface Definition

Interface	osid.course.plan.LessonAnchor
Implements	`osid.OsidCapsule`
Used By	`osid.course.plan.LessonAnchorList`
Description	A `LessonAnchor` forces a `Lesson` to begin at the specified `Activity` and optionally at a specified time.
Method	getLessonId
Description	Gets the `Id` of the lesson.
Return	`osid.id.Id`	the lesson `Id`
Compliance	`mandatory`	This method must be implemented.
Method	getLesson
Description	Gets the lesson.
Return	`osid.course.plan.Lesson`	the lesson
Errors	OPERATION_FAILED	unable to complete request
Compliance	`mandatory`	This method must be implemented.
Method	getActivityId
Description	Gets the `Id` of the activity.
Return	`osid.id.Id`	the activity `Id`
Compliance	`mandatory`	This method must be implemented.
Method	getActivity
Description	Gets the activity.
Return	`osid.course.Activity`	the activity
Errors	OPERATION_FAILED	unable to complete request
Compliance	`mandatory`	This method must be implemented.
Method	getTime
Description	Gets the time offset from the start of the acttvity where the anchor exists.
Return	`osid.calendaring.Duration`	a duration from the start of the activity
Compliance	`mandatory`	This method must be implemented.