branching question.

I'm thinking about using subversion to manage documents and other stuff at
work. I want to take advantage of it's branching abilities, but I'm not
sure how branches are handled. Based on the book:

http://svnbook.red-bean.com/en/1.0/svn-book.html#svn-ch-4-sect-1

It seems that when a branch is created, a new "copy" is created. In the
subversion database, are two separate "copies" stored or are future
revisions of the branch just stored as diffs from the version present when
the branch was created. The latter seems to be the most logical and
efficient. However, the documentation seems to indicate that a separate
copy is stored. This may be addressed in the documentation, and I may have
missed it.

-- 
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                            | /"\                         
 john harrold               | \ / ASCII ribbon campaign   
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 --Gandhi
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