Hi guys,
As you can guess, not the same people are fixing the Wiki articles, the library and the GDL language itself - not to mention the GDL Manual... We are working on all above areas with different resources and different priorities.
A note about Unicode characters: you are right with the problem of the editor interface. You have to see on the other hand that AC10 gave the possibility of creating actual Unicode GSM objects using ANY Unicode character. From AC13 on, you can have Unicode old-style listing definition files, too. All these efforts are made to create a character-encoding independent library platform. Naturally, this goal hasn't been met by AC13.
Regards,
Zsolt
Zsolt Táskai
ArchiCAD Development - GDL Team
AC13, AC14 and upwards...