OSID - osid.hierarchy.HierarchySequencingSession Service Interface Definition

Interface	osid.hierarchy.HierarchySequencingSession
Implements	`osid.OsidSession`
Description	This session provides methods to sequence the nodes in a hierarchy.
Method	getHierarchyId
Description	Gets the hierarchy `Id` associated with this session.
Return	`osid.id.Id`		the hierarchy `Id` associated with this session
Compliance	`mandatory`		This method must be implemented.
Method	getHierarchy
Description	Gets the hierarchy associated with this session.
Return	`osid.hierarchy.Hierarchy`		the hierarchy associated with this session
Errors	OPERATION_FAILED		unable to complete request
Errors	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	canSequenceHierarchy
Description	Tests if this user can change the hierarchy. A return of true does not guarantee successful authorization. A return of false indicates that it is known performing any update will result in a `PERMISSION_DENIED.` This is intended as a hint to an application that may opt not to offer these operations to an unauthorized user.
Return	`boolean`		`false` if changing this hierarchy is not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	moveNodeAhead
Description	Moves a node ahead of a refrence node under the given parent.
Parameters	`osid.id.Id`	`parentId`	the `Id` of the parent node
	`osid.id.Id`	`referenceId`	the `Id` of the node
	`osid.id.Id`	`id`	the `Id` of the node to move ahead of `referenceId`
Errors	NOT_FOUND		`parentId, referenceId,` or `id` not found, or `referenceId` or `id` is not a child of `parentId`
	NULL_ARGUMENT		`parentId, referenceId,` or `id` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	moveNodeBehind
Description	Moves a node behind a refrence node under the given parent.
Parameters	`osid.id.Id`	`parentId`	the `Id` of the parent node
	`osid.id.Id`	`referenceId`	the `Id` of the node
	`osid.id.Id`	`id`	the `Id` of the node to move behind `referenceId`
Errors	NOT_FOUND		`parentId, referenceId,` or `id` not found, or `referenceId` or `id` is not a child of `parentId`
	NULL_ARGUMENT		`parentId, referenceId,` or `id` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	sequenceNodes
Description	Sequences a set of nodes under a parent.
Parameters	`osid.id.Id`	`parentId`	the `Id` of the parent node
Parameters	`osid.id.Id[]`	`ids`	the `Id` of the nodes
Errors	NOT_FOUND		`parentId` or an `id` not found, or an `id` is not a child of `parentId`
	NULL_ARGUMENT		`parentId` or `ids` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.