Question about concurrent commits

Hi again,

I have just been perusing the interfaces in subversion/include/ and some
of the desing docs, and I had a question about concurrent commits. What
happens when two people are doing commits at the same time and both have
modified the same file foo.c:17. Assuming one of them finishes first,
their transaction is committed, and foo becomes foo.c:18. Then when the
second person commits, their delta is against foo.c:17, but the latest
copy in the repository is foo.c:18. From the way I interpreted the
design docs, a situation like this will cause a branch in the repository
at foo.c:17.

Am I correct? Or is there some other way that this type of situation is
handled?

-- 
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Kevin Pilch-Bisson
kevin@pilch-bisson.net
http://www.pilch-bisson.net