This attribute specifies a list of TOS byte values. An incoming
packet is considered to match this policy if its masked TOS byte
matches a value in the list. A bit-wise and operation is performed
with the TOS byte of the incoming packet and the tosMask attribute
of the referenced CosTreatment component before the comparison
is done.
This attribute must contain at least one TOS byte value, otherwise a
semantic check error is generated.