OSID - osid.control.SystemNode Service Interface Definition

Interface	osid.control.SystemNode
Implements	`osid.OsidNode`
Used By	`osid.control.SystemHierarchySession`
Used By	`osid.control.SystemNodeList`
Description	This interface is a container for a partial hierarchy retrieval. The number of hierarchy levels traversable through this interface depend on the number of levels requested in the `SystemHierarchySession`.
Method	getSystem
Description	Gets the `System` at this node.
Return	`osid.control.System`	the system represented by this node
Compliance	`mandatory`	This method must be implemented.
Method	getParentSystemNodes
Description	Gets the parents of this system.
Return	`osid.control.SystemNodeList`	the parents of this system
Compliance	`mandatory`	This method must be implemented.
Method	getChildSystemNodes
Description	Gets the children of this system.
Return	`osid.control.SystemNodeList`	the children of this system
Compliance	`mandatory`	This method must be implemented.