Message

Undeclared foo prefix: bar

Explanation

All namespace prefixes must be declared prior to use. Namespace prefixes are case-sensitive.

Solution

Correct the typo, or declare the prefix with an xmlns: attribute, for example:

<Url type="application/rss+xml"
     xmlns:example="http://example.com/opensearchextensions/1.0/"
     template="http://example.com?f={example:format?}"/>

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