How much software out
there is set to interpret an
element in the http://mashupguide.net namespace??”other
than to ignore it? If you use a widely used extension, the better your chances that there is software
that acts on those extensions. Some prominent RSS 2.0 extensions are as follows:
??? Media RSS (http://search.yahoo.com/mrss), used in Flickr
??? iTunes (http://www.apple.com/itunes/store/podcaststechspecs.html), used for
podcasting
??? OpenSearch (http://www.opensearch.org/Specifications/OpenSearch/1.1)
?– Tip Other XML dialects use XML namespaces in a similar fashion to enable extensions, so it??™s useful to
understand how extensions work in feeds to get a handle of how it works elsewhere.
CHAPTER 4 ?– WORKING WITH FEEDS, RSS, AND ATOM 85
6. http://examples.mashupguide.net/ch04/Atom1.0_Apress_ISBN.xml
There are few widely used Atom 1.0 extensions at this point. If you want to follow that
topic, I suggest the series of articles by James Snell on Atom 1.0 and various proposed
extensions.7
Now that you have studied three important formats for feeds (RSS 2.0, RSS 1.0, and Atom 1.0),
you??™ll learn how feeds are implemented in Flickr and then in other web sites.
Feeds from Flickr
You can find feeds in Flickr in several ways. First, you can look throughout the Flickr UI for the
orange feed icon and the text Subscribe To, as shown in Figure 4-1.
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