What do confliciting aliases mean?

[Kurosaka, T. <Ter...@io...>]

There are aliases that map to more than one converters in ICU.
For example Shift_JIS is an alias to both ibm-943_P14A-1999
and ibm-943_P130-1999, according to these:
http://oss.software.ibm.com/cgi-bin/icu/convexp?conv=ibm-943_P14A-1999&s=ALL
http://oss.software.ibm.com/cgi-bin/icu/convexp?conv=ibm-943_P130-1999&s=ALL

Which converter is actually used when Shift_JIS is specified ?
How ibm-943_P14A-1999 and ibm-943_P130-1999 differ?
What the middle element in these internal encoding names mean?

Thank you in advance.

T. "Kuro" Kurosaka
Internationalization Architect
ter...@io...
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