[1] UTS #10: Unicode Collation Algorithm ( (2013-09-27 22:15:14 +09:00 版)) http://www.unicode.org/reports/tr10/

[2] XPath and XQuery Functions and Operators 3.1 (2017-03-21 16:02:06 +09:00) https://www.w3.org/TR/2017/REC-xpath-functions-31-20170321/

[3] XSL Transformations (XSLT) Version 3.0 (2017-06-06 21:59:56 +09:00) https://www.w3.org/TR/2017/REC-xslt-30-20170608/#uca-collations

[4] CGJ