Categorized content
Less flat, more nested
Uses namespaces
Well-formedness required
Titles are required for entries
mode attribute specifies whether payload of a text construct
is escaped HTML, plain text, or real well-formed HTML, URL to content, some other XML format, or Base-64 encoded binary data
Supports XML Encryption and XML Digital Signature on individual entries
Item-level authors instead of one-per-feed
RELAX NG schema
xml:lang and xml:base