is "mailto:robyates70@gmail.com" a valid yadis id?

[rob]

As far as I can make out from the specification it is valid.  For 
example the Yadis spec says that a yadis id is

"A identifier used with one or more Yadis Services. A Yadis ID may be a 
URL; it may be any other identifier, such as an XRI, that can be 
resolved to a URL."

So if there is a rule that states that mailto: URL's resolve to 
http://domain_from_mailto_address then mailto's are valid Yadis id's 
e.g. mailto:robyates70 at gmail.com resolves to http://gmail.com.  Am I 
correct with this?

The reason that I ask is that we are investigating mechanisms to lookup 
a user's free time from their calendar.  See the later half of this post 
http://robubu.com/?p=8 for details.

What is hard to do is take an e-mail address and resolve that to a 
service (i.e. url endpoint) that provides a user's free time.  Yadis 
helps nicely here as the freetime service can be returned in the yadis 
document. 

Any advice would be much appreciated,

Thanks,

Rob