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As we mentioned earlier, each directory of a Subversion working copy contains a special subdirectory called .svn that houses administrative data about that working copy directory. Subversion uses the information in .svn to keep track of things such as:
Which repository location(s) are represented by the files and subdirectories in the working copy directory
Which revision of each of those files and directories is currently present in the working copy
Any user-defined properties that might be attached to those files and directories
Pristine (unedited) copies of the working copy files