The Unicode Technical Meeting discussed IDNA at the quarterly meeting. The following reflects the discussion on the local mapping in IDNA2008:<br><br><div style="margin-left: 40px;">Given a choice among the different options for mapping in IDNA2008, the UTC has
the following preferences. Note that UTS #46 contains a mapping that is based on
the same principles as IDNA2003, but has exceptions for the special cases
required by IDNA2008 (sharp s, etc.).<br><br>
1. Any Local Mapping allowed (current situation in IDNA2008) - <b>Very bad.</b><br><i>We foresee that in practice UTS 46 mappings would be used to maintain
compatibility with IDNA2003. However, it could also encourage incompatible
localized mappings, which would cause interoperability and security problems.</i><br><i> </i><br>
2. No mapping allowed - <b>Very bad. And unenforceable</b><br><br>
3. Silent on mapping - <b>Bad</b><br><i>We foresee that in practice UTS 46 mappings would be used to maintain
compatibility with </i><i>IDNA2003</i><i>. The danger here is the same as for
#1; it is not quite as bad as mentioning local mapping explicitly, thereby
implicitly encouraging it.</i><br><i> </i><br>
4. Discourage local mapping except for "compatibility with IDNA2003" - <b>Better</b><br><i>We foresee that in practice UTS 46 mappings would be used to maintain
compatibility with </i><i>IDNA2003</i><i>. Operationally this is the same as #3,
except that it is more explicit about the recommendation.</i><br><br>
5. Case Mapping incorporated into protocol - <b>Better</b><br><i>The UTC would modify UTS 46 so as to remove case mappings.</i><i> We foresee
that in practice the modified UTS 46 mappings would be used to maintain
compatibility with </i><i>IDNA2003</i><i>.</i><br><br>
6. Case + Width Mapping incorporated into protocol - <b>Better</b><br><i>The UTC would modify UTS 46 so as to remove case mappings and width mappings.</i><i>
We foresee that in practice the modified UTS 46 mappings would be used to
maintain compatibility with </i><i>IDNA2003</i><i>.</i><br><br>
7. UTS#46 Mappings incorporated in protocol - <b>Best</b><br><i>The UTC would discontinue UTS 46, as there would be no need for it.</i><br></div>
<i><br clear="all"></i>Mark<br>