[1] 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/#random-numbers

[3] ランダム文字列キー作るときによくつかうあれ - Qiita (2017-11-25 13:24:37 +09:00) https://qiita.com/wakaba@github/items/0282c5ffee86dd05ae99

[2] 雑にパスワードを生成する | tech - 氾濫原 (2017-11-24 10:26:02 +09:00) https://lowreal.net/2017/11/24/1