I've written Draft No. 2 today. Here are the changes I've made:

1) Replace ‘interface’ with ‘using new interface’ because it’s such a
commonly used identifier.
2) Remove erroneous use of ‘public’ on Page 2 – you never use this
keyword with an interface.
3) Add in shorthand for methods with the same signature.
4) Add in the use of the ‘delete’ keyword to deny access to a member.

The PDF is attached to this email, and also you can download the
latest draft from here:

      http://www.virjacode.com/download/interface_latest_draft.pdf