retrieve branch creation revision id

Hi there,

Given that a branch is simply a directory in my Subversion repository,
how do I retrieve the revision id responsible of a directory creation?

I suppose by analysing the "svn log" output, but can anybody tell me
what to look for?

Cheers,

-- 
Pierrick LE GALL
R&D engineer at Talend, Open data solution
http://www.talend.com
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