C14N isn't widely used?

Rich Salz says[1]

   Also c14n can already be broken by xmlns, so this doesn't create a
   new problem, it just makes an existing one bigger. Viewed
   parochially, web services use exc-c14n anyway, so let's use xml:id.

Is it true that Exec-C14N is actually the more widely deployed spec?

                                        Be seeing you,
                                          norm

[1] http://www.xml.com/pub/a/2005/02/23/salz.html 
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Norman.Walsh@Sun.COM / XML Standards Architect / Sun Microsystems, Inc.
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