When the notary is requested to sign a transaction, it either signs it, attesting that the outputs are the unique successors of the inputs, or provides conflict information for any input state that has been consumed by another transaction it has already signed.
In doing so, the notary provides the point of finality in the system.
Having two or more mutually exclusive fields in a form on a webpage/webapp is a pretty frequent scenario developers have to deal with.
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When soliciting input from users with an HTML form, you want to design forms to be as flexible as possible.
That means you build in multiple form fields to support multiple input options, even if you only want the user to fill in one of them.
Hence, it is the point at which we can say finality has occurred.
A transaction should only be signed by a notary if all of its input states point to the same notary.
Search for mutually validating:
It also makes authoring the pertinent form fields practically automatic.