[Japanese Details]

References for contextual rules

Code points: 
U+002D (HYPHEN-MINUS)                
                Cannot begin or end a label
                Cannot occupy 3rd and 4th position
                Reference RFC 5891 (4.2.3.1)


U+30FC (KATAKANA-HIRAGANA PROLONGED SOUND MARK)
U+3006 (IDEOGRAPHIC CLOSING MARK)
U+30FB (KATAKANA MIDDLE DOT)
                At least one point in the label must
                be in {Hiragana, Katakana, Han}
                Cannot commingle with Latin
                Reference RFC 5892 (Appendix 7)


U+309D..U+309E, U+30FC..U+30FE (MODIFIER LETTERS)
                Cannot begin a label
                Predelegation Tester request