[mew-int 01208] iso-8859-15 (aka Latin-0 or Latin-9)

[Kazu Yamamoto ( 山本和彦 )]

Hello guys,

I think Latin-0 is becoming more and more popular in Europe since
there are strong demands to express the euro sign. Since Latin-1 has
been used in Western Europe, people there need to live with both
Latin-0 and Latin-1 for some coming years.

I want to support a mechanism which allows you to live with Latin-0
and Latin-1 in more convenient manner. The following questions were
asked to a guy by me. To hear comments from other guys, I would like
to disclose them here:

Q1) Reading: Is it enough to display both Latin 1 and Latin 0 with X
    windows system? Or are you using multi-lingual terminal? If so,
    what kind of character set (excluding UTF-8) can display both
    Latin 1 and Latin 0 at the same time?

Q2) Writing: In a draft, how do you want to select input-method?
    Suppose that you are usually using Latin 1. But this time you want
    to input the euro sign. What kind of user interface should be
    provided to change the default input-method? Or is there any
    input-method to input all characters defined both in Latin 1 and
    Latin 0?

Q3) Replying1: You may want to select input method according to the
    message to be replied. For example, if the message to be replied
    is encoded with Latin 0, an input method for Latin 0 should be
    selected automatically. To implement this, is the following
    configuration enough?

(setq mew-charset-input-method-alist
      '(("iso-8859-1"  . "latin-1-postfix")
       ("iso-8859-2"  . "latin-2-postfix")
       ("iso-8859-15" . "latin-9-postfix")))

Q4) Replying2: You are replying to a Latin 1 message, however you
    input the euro sign. In this situation, both Latin 0 and Latin 1
    characters exist in a draft. I think Latin 1 characters should be
    converted into Latin 0, vise versa. What kind of user interface
    should be provided? e.g. Warning to the user and asking which
    character set should be used.

--Kazu