Tomasz Sterna wrote:

If you use it wrong, as in the example, or not use at all, you rely on
guessing the rest from the context.
And guessing, by its nature, is error prone. Especially when you lack
metadata or knowledge (like Autn Tillie).

Sure, if it is an email address, it would only make sense to use
the appropriate scheme prefix.

I made that example especially misleading and exaggerated as I was
only asking about the _potential_ confusion over the similarity.
Of course I was speaking of web pages, where it is a snap to give
email addresses correctly as useable links, which holds true as
well for jabber then (xmpp: if it's registered somewhen,
http://www.iana.org/assignments/uri-schemes).

What I was onto is the usage of purely informational identifiers,
namely "[EMAIL PROTECTED]" (real domain) and their
potential confusion to HUMANS (not the clients) - if not explicitely
turned into an appropriate html link tag (because there exists no
senseful protocol). It's still troublesome if you give @email and
@jabber addresses as correctly protocol prefixed links but have a
couple of textual [EMAIL PROTECTED] still elsewhere in a web page (people
on occasion overlook links, and thereby copy&paste the wrong info).

Ralph Meijer already answered the question I was onto - such user
confusion exists (even for pages which clearly state the situation),
it's just not measurable in hard numbers or such.
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