svn vs csup usage question

[Dennis Glatting]

I often modify configuration files in the src and ports tree. Normally
this isn't a problem becuase csup determines which files changed and
pulled fresh copies from the repository.

I doin't see a svn mechansim to do that, for example: 

	svn co -verify repo target

It appears the contents of .svn is all that is check on checkout and not
the files themselves.