Question about EXI Draft - EXI Format Version

Dear W3C EXI WG members,

I have a question about this draft specification.

EXI has a EXI format version (ref. S.5.3).

In the future, the version number will be over 1.
When an EXI parser read the EXI data having a version number other than
1, how should it process the EXI data ? 
  - Stop or continue parsing?
  - Pass error or warning event to the application?
  - Not define in the specification?

Regards,
Keisuke Tamiya (tamiya.keisuke@canon.co.jp)