[Enter description of this extension point] Class which implements org.eclipse.cdt.core.ICOwner This is a nature ID which the owner has. This is used to restore a ICDescriptor which has been deleted. If this is not provided the descriptor will be restore with no owner. A project with multiple natures will use the first matching nature searched in the reverse order in the Project Description. [Enter extension point usage example here.] [Enter API information here.] [Enter information about supplied implementation of this extension point.]