2.2.37 [HTML5] Section 5.6.3 Page load processing model for XML files

C0054: The root element performs a namespace-based lookup in order to determine if the content is a feed

The specification states:

 ... Page load processing model for XML files
     ...
     User agents may examine the namespace of the root Element node of this Document 
     object to perform namespace-based dispatch to alternative processing tools, e.g. 
     determining that the content is actually a syndication feed and passing it to a feed 
     handler. If such processing is to take place, abort the steps in this section, and 
     jump to the next step (labeled non-document content) in the navigate steps above.

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The root element performs a namespace-based lookup in order to determine if the content is a feed.

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