CJK stroke order data: kRSUnicode v. kRSKangXi

Adam Nohejl adam at nohejl.name
Fri Feb 28 12:56:43 CST 2014


I am comparing radical data for CJK characters from different sources, including the Unihan database. According to the Unihan documentation* the kRSUnicode radical should correspond to kRSKangXi radical, which in turn should be based on the Kang Xi dictionary.

Is there any explanation for the following discrepancies? Did I miss any other rules or reasoning behind the content of these two fields?

Examples of the discrepancies:

(1) A very common character for "most, maximum".
U+6700	kRSKangXi	73.8
U+6700	kRSUnicode	13.10

(2) A funny character for autumn containing the turtle component.
U+9F9D	kRSKangXi	115.16
U+9F9D	kRSKanWa	115.16
U+9F9D	kRSUnicode	213.5

There are also characters that actually are not included in the Kang Xi dictionary**, but the Unihan data contain both a purported Kang Xi radical and in addition to that a _different_ Unicode radical.

(3) The simplified turtle character (commonly assigned to the traditional radical #213):
U+4E80	kRSKangXi	213.0
U+4E80	kRSUnicode	5.10

(4) Character with the radical #72/73 at the top, i.e. IMHO an arbitrary decision, but unexpectedly the fields differ:
U+66FB	kRSKangXi	72.7
U+66FB	kRSUnicode	73.7

- - -

[*] <http://www.unicode.org/reports/tr38/tr38-8.html>: "Property: kRSUnicode // Description: (...) The first value is intended to reflect the same radical as the kRSKangXi field and the stroke count of the glyph used to print the character within the Unicode Standard."

[**] The two characters are missing from the '89 edition of Kang Xi (which should be the same as used for Unihan) according to search on this site: <http://ctext.org/dictionary.pl>

Adam Nohejl

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