version

The format and version of the feed.

Here is the complete list of known feed types and versions that may be returned in version:

atom

Atom (unknown or unrecognized version)

atom01

Atom 0.1

atom02

Atom 0.2

atom03

Atom 0.3

atom10

Atom 1.0

cdf

CDF

rss

RSS (unknown or unrecognized version)

rss090

RSS 0.90

rss091n

Netscape RSS 0.91

rss091u

Userland RSS 0.91

rss092

RSS 0.92

rss093

RSS 0.93

rss094

RSS 0.94 (no accurate specification is known to exist)

rss10

RSS 1.0

rss20

RSS 2.0

If the feed type is completely unknown, version will be an empty string.

Tip

This element always exists, although it may be an empty string if the version can not be determined.

See also

The Myth of RSS compatibility

Mark Pilgrim’s excellent analysis of the extraordinary variety of incompatibilities each version of “RSS” introduced.