Extension: Syndication
Extension Name: sy
Purpose: The Syndication namespace
is designed to give RSS feed readers and
aggregators hints as to how often a feed
is typically updated.
Declaration: The name space for Syndication
is defined at
http://purl.org/rss/1.0/modules/syndication/
<rss version="2.0" xmlns:sy="http://purl.org/rss/1.0/modules/syndication/">
Elements: The Syndication namespace
elements contained are only used at the
<channel> level.
<sy:updatePeriod> is used to set the
interval or units used by the <sy:updateFrequency>
elements and is explained in more detail
in it's description. Possible values: 'hourly',
'daily', 'weekly', 'monthly', or 'yearly'.
<sy:updateFrequency> is how often
the feed is typically updated. This helps
some automated systems that access RSS feeds
to know when it should check back for updates.
The <sy:updateFrequency> and the <sy:updatePeriod>
are used together. For example if your RSS
feed is typically updated every other week,
you would set the <sy:updatePeriod>
to 'weekly' and the <sy:updateFrequency>
to '2'.
<sy:updateBase> the date and time
that the update interval should be calculated
from. For example if a feed's <sy:updatePeriod>
is 'yearly' and its <sy:updateFrequency>
is '1' , the reading application won't know
from what date it should use to calculate
a year from, to then look for an update.
The date/time format is in W3CDTF format
(ie. 2006-01-25+14:00+02:00)
Example:
<!-- Snipped for Brevity -->
<channel>
<title>FeedForAll Syndication
Namespace Explanation
</title>
<link>http://www.feedforall.com/#syndication.htm
</link>
<description>Syndication is
a Namespace Extension
</description>
<sy:updatePeriod> weekly
</sy:updatePeriod>
<sy:updateFrequency> 1
</sy:updateFrequency>
<sy:updateBase> 2006-01-1+16:00-05:00
</sy:updateBase>
</channel>
<!--Snipped for Brevity-->
