MTOM and SOAP 1.1

[Seumas Soltysik]

Officially MTOM is incorporated into the SOAP 1.2 spec not the SOAP 1.1 spec. 
However, I see that CXF supports MTOM with SOAP 1.1. What spec/guideline was 
used to integrate MTOM with SOAP 1.1?
Regards,
Seumas Soltysik