declarative verb and performative verb

[tom3m]

In the book The English Verb: An Eploration of Structure and Meaning by Michael Lewis I found this:

1) I pronounce you husband and wife.

This usage is restricted to certain verbs - I shall call them declarative verbs - in which the saying of the sentence is the action described by the sentence. Further examples are:

I swear by almighty God... (the oath taken in court)
That's all right, I forgive you.

My question is whether the 'so-called' declarative verbs are the same thing as performative verbs.

Thank you in advance

[Tdol]

Those examples are to me.