def do_propset(self, subcmd, opts, *args):
        """Set PROPNAME to PROPVAL on files, dirs, or revisions.

        usage:
            1. propset PROPNAME [PROPVAL | -F VALFILE] PATH...
            2. propset PROPNAME --revprop -r REV [PROPVAL | -F VALFILE] [URL]
        
        1. Creates a versioned, local propchange in working copy.
        2. Creates an unversioned, remote propchange on repos revision.
        
        Note: svn recognizes the following special versioned properties
        but will store any arbitrary properties set:
          svn:ignore     - A newline separated list of file patterns to ignore.
          svn:keywords   - Keywords to be expanded.  Valid keywords are:
            URL, HeadURL             - The URL for the head version of the object.
            Author, LastChangedBy    - The last person to modify the file.
            Date, LastChangedDate    - The date/time the object was last modified.
            Rev, Revision,           - The last revision the object changed.
            LastChangedRevision
            Id                       - A compressed summary of the previous
                                         4 keywords.
          svn:executable - If present, make the file executable. This
            property cannot be set on a directory.  A non-recursive attempt
            will fail, and a recursive attempt will set the property only
            on the file children of the directory.
          svn:eol-style  - One of 'native', 'LF', 'CR', 'CRLF'.
          svn:mime-type  - The mimetype of the file.  Used to determine
            whether to merge the file, and how to serve it from Apache.
            A mimetype beginning with 'text/' (or an absent mimetype) is
            treated as text.  Anything else is treated as binary.
          svn:externals  - A newline separated list of module specifiers,
            each of which consists of a relative directory path, optional
            revision flags, and an URL.  For example
              foo             http://example.com/repos/zig
              foo/bar -r 1234 http://example.com/repos/zag

        ${cmd_option_list}
        """
        print "'svn %s' opts: %s" % (subcmd, opts)
        print "'svn %s' args: %s" % (subcmd, args)