def set_optional_elements(self):
self.set_categories()<EOL>self.set_copyright()<EOL>self.set_generator()<EOL>self.set_image()<EOL>self.set_language()<EOL>self.set_last_build_date()<EOL>self.set_managing_editor()<EOL>self.set_published_date()<EOL>self.set_pubsubhubbub()<EOL>self.set_ttl()<EOL>self.set_web_master()<EOL>
Sets elements considered option by RSS spec