UMLR — In Sequence diagrams it is unclear if the name of the Gate can be different from the name of the message

Formal Gate
A formal Gate is just a point on the inside of the frame, as the end of a message. They may have an explicit name (see Figure 17.4).

1) The word "they" should probably be "it".
2) However, the gate and the message are different nameable items. The examples, in Figure 17.3,4, and 5 all have one name which appears to be the name of the message.

All three examples,should be clarified, and at least one having both the message and gate named differently.

In the description of Figure 17.3, the gate is given the implicit name of out_Unlock. In an almost identical Figure 17.5, the description says the gate name is Unlock. Which is it?