Pure_html.RSSRSS support
val domain : _ string_attrval length : int to_attrval path : _ string_attrval port : int to_attrval protocol : _ string_attrval register_procedure : _ string_attrval type_ : _ string_attrval url_ : _ string_attrval version_2 : attrval author : _ text_tagval channel : std_tagval category : _ text_tagval cloud : void_tagval comments : _ text_tagval copyright : _ text_tagval description : _ text_tagval docs : _ text_tagval enclosure : std_tagval generator : _ text_tagval guid : _ text_tagval height : _ text_tagval image : std_tagval item : std_tagval language : _ text_tagval last_build_date : _ text_tagval link : _ text_tagval managing_editor : _ text_tagval pub_date : _ text_tagval rss : std_tagval title : _ text_tagval ttl : _ text_tagval url : _ text_tagval web_master : _ text_tagval width : _ text_tag