def propget(self, prop, rev, path=None):
        """Get Subversion property value of the path"""
        rev, prefix = self._maprev(rev)
        if path is None:
            return self._propget(prop, str(rev), None)
        else:
            path = type(self).cleanPath(_join(prefix, path))
            return self._propget(prop, str(rev), path)
Get Subversion property value of the path