ROADMAPS
(a snapshot as of 2006-04-12)
(http://www.dkuug.dk/JTC1/SC2/WG2/docs/roadmaps.html)
The intention of the roadmaps document is to show a visual layout of the coding space for further allocations of scripts in ISO/IEC 10646 (also in the Unicode Standard). These roadmap layouts are snapshots of scripts and characters that are known as of 2006-04-12 (prior to WG2 meeting no. 48, Mountain View, CA, USA, 2006-04-21/24). This document is intended to be used as general guideline and does not attempt to make detailed allocations of characters.
Table 1 outlines the different planes of ISO/IEC 10646 and their generic contents.
Table 1: Allocations for Planes in ISO 10646 | ||
Range of Code Positions (Hex) | Plane # | Name of Plane |
---|---|---|
00000000 ... 0000FFFF | Plane 0 | Basic Multilingual Plane - BMP; envisioned for encoding all contemporary scripts and symbols including most frequently used ideographs. |
00010000 ... 0001FFFF | Plane 1 | Supplementary Multilingual Plane for scripts and symbols - SMP; envisioned for encoding future non-Ideographic and non-Unified Ideographic scripts and symbols. |
00020000 ... 0002FFFF | Plane 2 | Supplementary Ideographic Plane - SIP; envisioned as containing future Unified Ideographic characters. |
00030000 ... 0003FFFF | Plane 3 | Reserved for Future Allocation; should Plane 2, the SIP (Supplementary Ideographic Plane) prove insufficient for future Han character encoding, it is anticipated that further allocations may be provided on Plane 3. |
00040000 ... 0004FFFF to 000D0000 ... 000DFFFF | Plane 4 to Plane 13 | Reserved for Future Allocations. |
000E0000 ... 000EFFFF | Plane 14 | Supplementary Special-purpose Plane - SSP; envisioned for encoding special characters such as alphabet used for language tagging. |
000F0000 ... 000FFFFF | Plane 15 | Reserved for Private Use. |
00100000 ... 0010FFFF | Plane 16 | Reserved for Private Use. |
The roadmap layouts are maintained by an adhoc group on Roadmaps. This group's latest working document is located at Roadmaps to Unicode. Snapshots from these layouts are submitted for WG2 acceptance for the continued work on ISO/IEC 10646 and is closely coordinated with the work on the Unicode Standard in liaison with the Unicode Consortium.
The latest snapshot of the roadmaps that reflects the resolutions from WG2 meeting M47 held 2005-09-12/15, for the BMP, SMP, SIP and SSP, and some later updates, can be found at:
Please note that this roadmap consolidates into a single document information for each of the planes 0, 1, 2 and 14.
The above roadmaps indicate that these three planes should suffice for all future encoding of characters having world-wide utility. In addition,
The SSP or Plane 14 roadmap
(snapshot of
ssp-4-2, 2005-06-27)
locates all script and individual character additions included in ISO/IEC 10646: 2003 and in Amendment 1 (the equivalent of repertoire of Unicode 4.1), plus those in FDAM2 and those accepted for PDAM3, and all script additions currently foreseen to be reasonable candidates for future encoding in the SSP.
This plane is used for encoding special characters such as alphabet used for language tagging, and variation selectors.
Note that additional 10 supplementary planes are available for encoding (with an additional 2 planes reserved for private use).
The layouts show the different scripts in various stages of progression - published, accepted but not yet published, under evaluation in UTC and WG2, exploratory having some preliminary documentation, or open with no proposal documents.