Doug Ewell wrote: > What is the correct IBM GCGID value for U+03B8 GREEK SMALL LETTER THETA? > Is it GT610000 or GT610002?
I have an internal document that shows GT610000 Theta Small - (see GT610001, GT610002) U00003B8 GREEK SMALL LETTER THETA GT610001 Theta Small (Open Form) - (resembles SA50) U00003D1 GREEK THETA SYMBOL GT610002 Theta Small (Closed Form) SA500000 Curly Theta Symbol - (resembles GT610001) The last digit in the GCGID is 0 for the generic GCGID for which any glyph can be chosen. A non-zero digit selects a specific, registered glyph - quite similar to the Ideographic Variation Selectors. Generally, the first four characters in the GCGID define the abstract character, and the other four (if present) specify appearance. (No, I am not an expert in GCGIDs; I am looking this definition up in the Character Data Representation Architecture (CDRA) Reference. See http://www6.software.ibm.com/devcon/devcon/docs/cdrovr00.htm) > The Unicode 1.1 lists (UNICHP6B.TXT and UNICHP6C.TXT) are inconsistent > in this regard. Some entries, even within the same file, show GT610000 > while others show GT610002. The tables printed in Unicode 1.0 book are > the same. For both GT610000 and GT610002 the first internal document shows a glyph like the one for U+03b8 in the Unicode 3.0 book. For GT610001 and SA500000 it shows a glyph like TUS 3.0 for U+03d1. > IBM has a Web page containing many PDF charts of code pages, and they > have the same problem: some show one GCGID for U+03B8, others show the > other one. > > I suppose this might have had something to do with confusion over U+03D1 > GREEK THETA SYMBOL, but that character (a glyph variant of U+03B8) has > been in Unicode since 1.0. Was there some dispute at that time over the > preferred glyphs for U+03B8 and U+03D1? I remember that they were > swapped in Unicode at one point. Was the inconsistency in GCGID a > precursor to the decision to swap glyphs? Well, these GCGIDs are just glyph variants, too. > Any ideas? (It's probably best not to ask why I am paying attention to > GCGIDs in the first place.) I hope this helps - best regards, markus -- Opinions expressed here may not reflect my company's positions unless otherwise noted.
