docs: def do_export(self, subcmd, opts, *args):
          """Create an unversioned copy of a tree.
  
          usage:
              1. export [-r REV] URL [PATH]
              2. export [-r REV] PATH1 [PATH2]
          
          1. Exports a clean directory tree from the repository specified by
             URL, at revision REV if it is given, otherwise at HEAD, into
             PATH. If PATH is omitted, the last component of the URL is used
             for the local directory name.
          
          2. Exports a clean directory tree from the working copy specified by
             PATH1, at revision REV if it is given, otherwise at WORKING, into
             PATH2.  If PATH2 is omitted, the last component of the PATH1 is used
             for the local directory name. If REV is not specified, all local
             changes will be preserved, but files not under version control will
             not be copied.
  
          ${cmd_option_list}
          """
          print "'svn %s' opts: %s" % (subcmd, opts)
          print "'svn %s' args: %s" % (subcmd, args)