Flex SDK to support cross-versioning: the Marshall Plan

Reading the Alex Harui's blog, I found  this interesting post about a new Adobe Open Source project called the Marshall Plan. I read that the  "Marshall Plan" is the nickname for the SDK feature to support cross-versioning.

Thus, the Marshall Plan is really two things:

• Cross-Versioning Support: SWFs are in the same SecurityDomain but different ApplicationDomains and may have been compiled by different versions of Flex.
• Untrusted Application Support: SWFs are loaded into different SecurityDomains and cannot access the main application or the Stage and other restricted resources.

This is something I want to  investigate on.