RSS Validator

Avoid Namespace Prefix: foo

While XML Namespaces permits the declaration of prefixes for namespaces such as atom and xhtml; to date such declarations haven't proven to be very interoperable in the context of an Atom document.

Here are a few links to prior discussions on the topic:

• Aristotle Pagaltzis
• Atom XML Namespace Conformance Tests
• Tim Bray
• James Holderness

Employ the use of default namespaces (i.e., xmlns=) in all Atom and XHTML elements that appear in your feed.

You might be able to find help in one of these fine resources.