Fast Infoset: does the name fit?

Question for the Sun folks:

You've been careful to call your binary format "Fast Infoset" and not 
use the word XML. That's better. However, what about the word "Infoset"? 
Is FI a faithful representation of the XML Infoset? In particular,

1. Does FI refuse to encode XML documents that do not have well-defined 
infosets? For instance, does it disallow relative namespace URIs? Does 
every FI have a well-defined XML infoset?

2. Can FI represent infosets that do not have equivalent XML 
serializations? For instance, infosets in which the in-scope namespaces 
property is inconsistent with the namespace attributes property?

-- 
Elliotte Rusty Harold  
XML in a Nutshell 3rd Edition Just Published!
http://www.cafeconleche.org/books/xian3/
http://www.amazon.com/exec/obidos/ISBN=0596007647/cafeaulaitA/ref=nosim