|Description||string||SAProposal is a base class defining the common properties of, and anchoring common associations for, IPsec phase 1 and phase 2 proposals. It is defined as a kind of ScopedSettingData (scoped by a ComputerSystem or AdminDomain), since its subclasses define sets of IPsec properties that MUST be applied together, if negotiated. This subclassing is different than that defined in IETF's IPSP Policy draft - where it is subclassed from Policy. The definition as SettingData is more consistent with the application of the properties as a set, to the negotiated Security Association. To indicate that 'this' proposaltransform is negotiated for a Security Association, use the ElementSettingData to associate the proposal and the SA.