SC2 WG2 Nxxxx



Title: Proposed Changes to ISO/IEC 10646 Annex I Ideographic description characters
From: Unicode & US National Body
Date: February 9, 2012


ISO/IEC 10646 defines Ideographic Description Sequences (IDSes) in Annex I, and imposes two kinds of restrictions:


Those restrictions are actually problematic for two main users of IDSes, namely the IRG and the UTC. The IRG uses IDSes of existing and proposed characters, as a tool to detect potential unifications; those IDSes actually involve private use characters as components. Similarly, potential characters are tracked in UTR#45; for example, the IDS of the biáng character (see exceeds the overall limit.


The proposal is to modify annex I to:


The UTC has already approved similar changes to The Unicode Standard.