Thank you both for your responses.
--Kevin
kevinr@valicert.com
-----Original Message-----
From: David Blondeau [mailto:blondeau@intalio.com]
Sent: Friday, June 23, 2000 3:41 PM
To: Kevin Regan; John Boyer
Cc: w3c-ietf-xmldsig@w3.org
Subject: Re: Attribute normalization
Hi Kevin,
[...]
> So, it seems that only #x20 characters will be seen in attribute
values.
> Why does the
> spec mention the other values (#xD, #xA, #x9)?
Because as said in the first point of 3.3.3
"--a character reference is processed by appending the referenced
character
to the attribute value"
if you had 
 in an attribute value of your inital document, then the
processor would have dereferenced the character to #xD so when you
serialize
it, you have a #xD character in atribute value.
David