If the States want to vote or ratification shows the consent obtained by a treaty obligation. With the condition that some provisions do not accept or agree with some of the changes.
If the state wants to sign or ratify expressed consent to be bound by the treaty. It is not acceptable provided that certain provisions. Or accepted by a particular change.
The state wants to sign or ratify the treaty obligations according to consent to get The conditions against some provisions. Or accepted by the change.