An nsIFeedEntry represents an Atom or RSS entry/item. Summary
and/or full-text content may be available, but callers will have to
check both.
Uses description, subtitle, summary, content and extensions
to generate a summary.
The date the entry was published, in RFC822 form. Parsable by JS
and mail code.
Uses atom:content and content:encoded to provide
a ‘full text’ view of an entry.
Enclosures are podcasts, photocasts, etc.
Enclosures, etc. that might be displayed inline.