This document specifies a set of Label Generation Rules (LGR) for the Bulgarian 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 Bulgarian Language” [Ref-LGR-bg-Cyrl], 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 30 Cyrillic code points (23 + 9 as defined by RFC 5992 [130]). CLDR in its auxiliary list adds 7 code points of which 2 correspond to historic letters. These code points are U+0463 CYRILLIC SMALL LETTER YAT and U+046B CYRILLIC SMALL LETTER BIG YUS. They are also excluded from [MSR-5] as being obsolete. Of the other 5, 3 have no other sources and are not included. The last 2: U+0450 CYRILLIC SMALL LETTER IE WITH GRAVE and U+045D CYRILLIC SMALL LETTER I WITH GRAVE have additional sources and are part of the extended set.
Note: The article in [605] indicates that “In Bulgarian and Macedonian, the grave accent is sometimes, although not very often, used on the vowels а, о, у, е, и and ъ (ъ exists in Bulgarian only) to mark stress. In a few cases (mostly on the vowels е and и) the stress mark is orthographically required to distinguish words which are Homographs".
There is an IDN table published in the IANA Repository of IDN Practices for Bulgarian by .bg (Bulgaria cctld) in [700]
Letters documented in some references but not included:
U+044B CYRILLIC SMALL LETTER YERU
U+044D CYRILLIC SMALL LETTER E
U+0451 CYRILLIC SMALL LETTER IO
U+0463 CYRILLIC SMALL LETTER YAT
U+046B CYRILLIC SMALL LETTER BIG YUS
U+0463 CYRILLIC SMALL LETTER YAT
U+0430 U+0300 CYRILLIC SMALL LETTER A WITH GRAVE ACCENT
U+043E U+0300 CYRILLIC SMALL LETTER O WITH GRAVE ACCENT
U+0443 U+0300 CYRILLIC SMALL LETTER U WITH GRAVE ACCENT
U+044A U+0300 CYRILLIC SMALL LETTER HARD SIGN WITH GRAVE ACCENT
U+044E U+0300 CYRILLIC SMALL LETTER YU WITH GRAVE ACCENT
U+044F U+0300 CYRILLIC SMALL LETTER YA WITH GRAVE ACCENT
A number of letters not considered essential to writing the core vocabulary of the language are nevertheless in common use. Where they have not been added to the core repertoire, they are flagged as “extended-cp” in the table of code points. A context rule is provided that by default will prohibit labels with such extended code points. To support extended single code points or code point sequences, delete the context “extended-cp” from their repertoire definition.
Any code points outside the Bulgarian Language repertoire that are targets for out-of-repertoire variants would be included here only if the variant is listed in this file. In this case they are identified as a reflexive (identity) variant of type “out-of-repertoire-var”. Whether or not they are listed, they do not form part of the repertoire.
There are no variants defined between Cyrillic letters.
No ASCII Variants: Note that this LGR does not contain definitions for “blocked” variants for letters that look indistinguishable from ASCII letters (homoglyphs). If concurrent use of LDH labels is desired, the resulting conflicts can be handled by using the “Common LGR” in processing. For details, see Section 3, “Use of Multiple Reference LGRs in the Same Zone” in [Level-2-Overview].
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].
Variant-related actions included to facilitate integration as appropriate.
The LGR in this document has been adapted from the corresponding Reference LGR for the Second Level. The Second Level Reference LGR for the Bulgarian 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 Bulgarian Language [Ref-LGR-bg-Cyrl] 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 reference for the language:
Scatton, Ernest B. 1993. “Bulgarian”, in Bernard Comrie & Greville G. Corbett, eds. The Slavonic languages. London; New York: Routledge. ISBN 0-415-04755-2
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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