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On Aug 31, 2012, at 6:54 AM, Donald Stufft <donald.stufft@gmail.com> wrote:

On Friday, August 31, 2012 at 6:48 AM, "Martin v. Löwis" wrote:
3\. There should be a specification of how collisions between extension
fields and standard fields are resolved. E.g. if I have

Extension: Home

is Home-page the extension field or the PEP 345 field? There are
several ways to resolve this; I suggest giving precedence to the
standard field (unless you specify that extensions must follow all
standard fields, in which case you can drop the extension prefix
from the extension keys).
Unless i'm mistaken (which I may be!) I believe that a / can be used as
the separator between the namespace and the "real" key.

Home-page: http://www.python.org
Extension: Home
Home/other-thing: Foo


Not bad.

Doing this is the "Extension" field required?

Yes it is required. A simple lookup for data \['extension'\] tells you what to expect.