From: Ken Whistler (email@example.com)
Date: Wed May 18 2011 - 12:38:54 CDT
On 5/17/2011 11:37 PM, fantasai wrote:
> On this topic, I've been wondering, how come the ideographic description
> characters aren't used to set Egyptian hieroglyphic? They seem at least
> as powerful as the MdC notation described in Unicode section 14.18.
Several reasons, I think.
1. IDC's aren't isomorphic with the MdC notation, and are unfamiliar to
who would be using it for hieroglyphics.
2. Ideographic Description Sequences, by *definition* are constrained
to sequences involving CJK radicals and CJK unified ideographs. There
is talk of loosening up that definition slightly to let them be used for
clearly siniform scripts such as Tangut and Jurchen, but conceptually the
structural assumptions made by the IDC's don't apply very well or very
generically to glyph description outside of siniform scripts.
3. MdC is conceived of as markup for layout, rather than glyph description
per se. As a result, the chunks described by MdC have variable sizes and
are not constrained the same way as IDS's. An IDS always describes one
and exactly one CJK ideograph. And IDS's are *not* markup for layout;
there is no expectation that a rendering implementation is expected to
parse an IDS and substitute an appropriately constructed CJK ideograph
glyph on the fly for display.
4. The implementation constraints on the embedding and recursion depth
for MdC and IDS's are different.
5. MdC markup can be done entirely with ASCII characters, which is viewed
as a plus for entry and display, by those familiar with it.
>> But if it is included in this table, note that Cuneiform also has
>> instances of vertical layout.
> So, the entry would be
> Xsux ; Cuneiform ; rotate
I think the correct answer is "translate". The Cuneiform signs don't turn
sideways when laid out vertically. They are just stacked vertically down
the line, as far as I know. But it would help to get somebody familiar
with monumental inscriptions to verify.
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