IDNA Rules and Derived Property Values

Created

2010-03-31

Last Updated

2024-04-26

Reference

[RFC5892][RFC6452][RFC8753][RFC9233]

Note

IDNA does not require that applications and libraries, either for
registration/storage or lookup, support any particular version of
Unicode.  Instead, they are required to use derived property
values based on calculations associated with whatever version of
Unicode they are using elsewhere in the application or library.
For the convenience of application and library developers and
others, the IETF has supplied, and IANA maintains, derived
property tables for several version of Unicode as listed below.
It should be stressed that these are not normative in that, in
principle, an application can do its own calculations and these
tables can change as IETF understanding evolves.  By contrast, the
list of code points requiring contextual rules and the associated
rules are normative and should be treated as updates to the list
in [RFC5892].
    
This registry is based on Unicode 12.0.0. 
    
Older versions of this registry: 
[Unicode 5.2.0], [Unicode 6.0.0], [Unicode 6.1.0], [Unicode 6.2.0], 
[Unicode 6.3.0], [Unicode 7.0.0], [Unicode 8.0.0], [Unicode 9.0.0], 
[Unicode 10.0.0], [Unicode 11.0.0]
  

Available Formats

XML
HTML
Plain text

Registries Included Below

• IDNA Contextual Rules
• IDNA Derived Properties

IDNA Contextual Rules

Registration Procedure(s)

IETF Review

Reference

[RFC5892][RFC6452][RFC8753][RFC9233]

Available Formats

CSV

False;
If Canonical_Combining_Class(Before(cp)) .eq.  Virama Then True;
If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C
(Joining_Type:T)*(Joining_Type:{R,D})) Then True;

False;
If Canonical_Combining_Class(Before(cp)) .eq.  Virama Then True;

False;
If Before(cp) .eq.  U+006C And
   After(cp) .eq.  U+006C Then True;

False;
 If Script(After(cp)) .eq.  Greek Then True;

False;
If Script(Before(cp)) .eq.  Hebrew Then True;

False;
If Script(Before(cp)) .eq.  Hebrew Then True;

False;
For All Characters:
   If Script(cp) .in. {Hiragana, Katakana, Han} Then True;
End For;

True;
For All Characters:
   If cp .in. 06F0..06F9 Then False;
End For;

True;
For All Characters:
   If cp .in. 0660..0669 Then False;
End For;

IDNA Derived Properties

Registration Procedure(s)

Expert Review

Expert(s)

Patrik Faltstrom (team lead), Takahiro Nemoto, Peter Saint-Andre

Reference

[RFC5892][RFC6452][RFC8753][RFC9233][Unicode Character Database 12.0.0]

Available Formats

CSV