Some review comments below:
1)This document says something about internaitonalisation, but some wording related to internaitonalisation make the readers confusing.
For example, in section 5.2.2, there is a definition " DNS NAME  The name to continue with in DNS.  The value is UTF-8 encoded and 0-terminated." It seems to indicate that the DNS name can be UTF-8. If it is a DNS name, it should be in ASCII, not in UTF-8 because all names including IDN stored in DNS are in ASCII or A-label form. 

2)It seems that both this system and current DNS share the same name space. So it is possible that two name spaces will collide with each other in the future. It may confuse the future applications when looking up for the same name. Does this name belong to DNS or GNU name system?

3)It is interested to know that there is a section named with "GANA Considerations". It seems that GANA will replace some function of IANA.
  If we follow the current way, the parameters produced by this document need to be managed by IANA instead of GANA.

4)ICANN manages the DNS name root space. I suggest to ask some experts from ICANN to review this document.