<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _IsValidUrl(self, url):
 """Checks if an URL is considered valid. Returns: bool: True if the URL is valid. """

    parsed_url = urlparse.urlparse(url)
    return parsed_url.scheme in self._SUPPORTED_URL_SCHEMES