>That aside, I do agree that the protocol/scheme thing is an issue that needs
>addressing, at least from a best practices point of view. Personally I'd go
>for a variant on the 'any' option, - follow the advice of "Architectural
>Principles of the World Wide Web" , and only allow IANA  registered
>schemes. Of the schemes you mention the only one missing from this list is
I'll agree with the above too - if I knew where to search for that
document, I would have used that instead. I'd want to see the RSS 2.0 docs
RSS places restrictions on the first non-whitespace characters of the
data in <link> and <url> elements. The data in these elements must be
an [IANA registered scheme], such as http://, https://, ftp://, mailto:,
news://, etc. (for a full list, check the [IANA website]).
The  links would be the URL above.
Morbus Iff ( i assault your sensibilities! )
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