"Applies the statements from the specified policy\ndefinition and then returns control the current\npolicy statement. Note that the called policy may\nitself call other policies (subject to\nimplementation limitations). This is intended to\nprovide a policy 'subroutine' capability. The\ncalled policy should contain an explicit or a\ndefault route disposition that returns an\neffective true (accept-route) or false\n(reject-route), otherwise the behavior may be\nambiguous and implementation dependent" . . . . . .