"However, profile exchange is optional"

[sites at thirdvisit.co.uk]

On the Yadis site's FAQ there is this paragraph:

http://yadis.org/wiki/YADIS_FAQ

Is supporting the profile exchange a requirement for all YADIS-compliant servers, or is it an optional feature?

Most servers will probably want to implement a basic profile query so that they can greet users with "Hi Bob!" instead of "Hi http://example.com/bob!". However, profile exchange is optional. 

Question:

Is this basically what I was proposing in my previous posts a "Turin tested Profile Exchange"?

"OpenID - anti-spam compatibility with other systems"

http://markcross.wordpress.com/2006/01/06/openid-getting-mass-take-up-anti-spam/
&
http://markcross.wordpress.com/2006/01/10/turin-tested-profile-exchange/

And if so, why should this NOT go in the v1.0 spec for Yadis?

Cheers,

Mark