RSS 2.0 builds upon the RSS 0.91 spec. It's backwards compatible, so tools that work with RSS 2.0 should work with 0.91 feeds. The updated spec adds a few elements, such as and .
It also reduces some restrictions. Previously, the and elements could only be http or ftp; now, any valid URI can be used. In RSS 0.91, each channel could only contain 15 items, and elements were limited in length; these limits have been removed. Larger values should still be used with caution, because they may cause problems with older applications.
The greatest change, though, is the ability to extend the format using namespaces. RSS 2.0 supports namespaces, a standardized approach to adding elements not found in the spec. Feeds can contain new elements if they are defined in a namespace.
It also reduces some restrictions. Previously, the and
The greatest change, though, is the ability to extend the format using namespaces. RSS 2.0 supports namespaces, a standardized approach to adding elements not found in the spec. Feeds can contain new elements if they are defined in a namespace.
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