def METHOD_NAME(self, propstat=propstat):
    # DAV helper method - return a propstat element indicating
    # property names for all properties in this PropertySheet.
    result = []
    for name in self.propertyIds():
        result.append('  <n:%s/>' % name)
    if not result:
        return ''
    result = '\n'.join(result)
    return propstat % (self.xml_namespace(), result, '200 OK', '')