The optional objects are: language, copyright, managingEditor, webMaster, pubDate, lastBuildDate, category, generator, docs, cloud, ttl, image, rating, textInput, skipHours, and skipDays.
可选对象是：language,copyright、managingEditor,webMaster、pubDate,lastBuildDate、category,generator、docs、cloud、ttl、image、rating、textInput、skipHours和 skipDays。
The optional objects are: language, copyright, managingEditor, webMaster, pubDate, lastBuildDate, category, generator, docs, cloud, ttl, image, rating, textInput, skipHours, and skipDays.
可选对象是：language,copyright、managingEditor,webMaster、pubDate,lastBuildDate、category,generator、docs、cloud、ttl、image、rating、textInput、skipHours和 skipDays。
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