title: The title of the item. link: The URL of the item. description: The item synopsis. author: Email address of the author of the item. category: Includes the item in one or more categories. comments: URL of a page for comments relating to the item. enclosure: Describes a media object that is attached to the item. guid: A string that uniquely identifies the item. pubDate: Indicates when the item was published. source: The RSS channel that the item came from.
The idea of the RSS feed is to show a description and then take the user to the content. I am not sure exactly how two descriptions would be useful but that doesn't mean that I know everything.