This document specifies a set of Label Generation Rules (LGR) for the Icelandic language using a language-specific repertoire for the second level domain or domains identified above. The format of this file follows [RFC 7940]. This LGR is adapted from the “Reference LGR for the Second Level for the Icelandic Language” [Ref-LGR-is-Latn], for details, see Change History below.
Standalone LGR: This LGR is designed to be used in a zone that does not cater to IDNs other than those valid under this LGR. This LGR lacks features that would allow its use in the context of another LGR in the same zone, and it may contain other features incompatible with such use.
All references converge on 36 Latin code points for the essential repertoire.
There is no IDN table published in the IANA Repository of IDN Practices for the .is ccTLD, but the registry provides IDN information [700]. For Icelandic there exists a source, “Nordic Cultural Requirements”, [501]-[504], that explicitly addreses the repertoire needed for IT purposes. It presents four categories of letters, from “essential” to “rare”.
Letters documented in some references but not included:
U+00E3 LATIN SMALL LETTER A WITH TILDE
U+00E4 LATIN SMALL LETTER A WITH DIAERESIS
U+00E5 LATIN SMALL LETTER A WITH RING ABOVE
U+00E8 LATIN SMALL LETTER E WITH GRAVE
U+00EB LATIN SMALL LETTER E WITH DIAERESIS
U+00F8 LATIN SMALL LETTER O WITH STROKE
U+00F9 LATIN SMALL LETTER U WITH GRAVE
U+00FB LATIN SMALL LETTER U WITH CIRCUMFLEX
U+00FC LATIN SMALL LETTER U WITH DIAERESIS
U+0119 LATIN SMALL LETTER E WITH OGONEK
U+01EB LATIN SMALL LETTER O WITH OGONEK
U+01FD LATIN SMALL LETTER AE WITH ACUTE
U+01EB U+0301 LATIN SMALL LETTER O WITH OGONEK AND ACUTE
U+01FF LATIN SMALL LETTER O WITH STROKE AND ACUTE
None.
The four letters ‘c’, ‘q’, ‘w’ and ‘z’ do not form part of the modern alphabet, the first three being only used in words of foreign origin. Nevertheless, the relevant standard, [501], explicitly considers them part of the “essential” set, and they are thus included in the core repertoire. The references consulted diverge strongly on candidates for other extended code points, therefore, this LGR selects none.
No variants are applicable when using the LGR in a standalone fashion.
This LGR does not define named character classes.
By default, the LGR includes the rules and actions to implement the following restrictions mandated by the IDNA protocol. They are marked with ⍟.
This LGR includes the default actions for LGRs as well as the action needed to invalidate labels with misplaced combining marks. They are marked with ⍟. For a description see [RFC 7940].
The LGR in this document has been adapted from the corresponding Reference LGR for the Second Level. The Second Level Reference LGR for the Icelandic Language was developed by Michel Suignard and Asmus Freytag, including input by Michael Everson, Nicholas Ostler, and Wil Tan, and based on multiple open public consultations.
Language tag has been updated.
Unicode Version has been updated.
This version modifies the Second Level Reference LGR for the Icelandic Language [Ref-LGR-is-Latn] by injecting the complete (maximal) set of cross-repertoire variants, including any imposed by transitivity. Injected variants are marked by special comments. Any character classes, context and WLE rules required for testing are also imported. In all other respects, description or annotations have not been updated to reflect the injected variants. Any LGR elements that might pose a possible conflict when the LGR is used with the Common LGR for cross-repertoire variant resolution are clearly marked. All modifications are carried out mechanically; there may be an occasional context rule or similar that is injected because its definition relates to some repertoire element even though it can never be triggered by any label valid under the modified LGR.
General references for the language:
Íslensk málnefnd. 1992. in Icelandic Council for Standardization. 1992. Nordic cultural requirements on information technology. Reykjavík: Staðlaráð Íslands. ISBN 9979-9004-3-1
Wikipedia: “Icelandic orthography”, https://en.wikipedia.org/wiki/Icelandic_alphabet
Wikipedia: “Eth”, https://en.wikipedia.org/wiki/Eth
Other references cited in this document:
In the listing of the repertoire by code point, references starting from [0] refer to the version of the Unicode Standard in which the corresponding code point was initially encoded. Other references (starting from [100]) document usage of code points. Entries in the table may have multiple source reference values. In the listing of whole label evaluation and context rules, reference [150] indicates the source for common rules. For more details, see the Table of References below.
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