Root Zone Label Generation Rules for the Myanmar script

Overview

This file contains Label Generation Rules (LGR) for the Myanmar script for the Root Zone. For more details on this LGR and additional background on the script, see “Proposal for a Myanmar Script Root Zone Label Generation Rule-Set (LGR)”; [Proposal-Myanmar]. This file is one of a set of LGR files that together form an integrated LGR for the DNS Root Zone [RZ-LGR-5]. The format of this file follows [RFC 7940].

Repertoire

The Root Zone LGR for the Myanmar script lists 163 entries in total; consisting of 98 Myanmar script unique code points and 65 sequences. The code point U+1063 ( ၣ) Myanmar Tone Mark Sgaw Karen Hathi is not listed separately, but is available as part of a defined sequence, bringing the total to 99 distinct code points.

The repertoire includes code points used by languages written in Myanmar script that fall within levels 1 to 4 on the [EGIDS] scale, as well as EGIDS 5 languages which have more than 500,000 users are included in the analysis. They are Burmese, Shan, Rakhine, S’gaw Karen, Mon, Pa’O Karen. (See also [Ethnologue].) A non-exhaustive list of languages using each code point can be found in the comments. For more details, see Section 5 “Repertoire” in [Proposal-Myanmar].

Note: In this document, to avoid confusion, the term ‘Myanmar’ is used for the Myanmar script and the term ‘Burmese’ is used for the Myanmar language.

The repertoire is based on [MSR-5], which is a subset of [Unicode 11.0].

Code points outside the Myanmar script that are listed in this file are targets for out-of-script variants and are identified by a reflexive (identity) variant of type “out-of-repertoire-var”. They do not form part of the repertoire.

As part of the Root Zone, this LGR includes neither digits nor the HYPHEN-MINUS.

Each code point is tagged with the script or scripts with which the code point is used, one or more other character categories, and one or more references documenting sufficient justification for inclusion in the repertoire; see “References” below. For code points that are part of the repertoire, comments identify the languages using the code point along with their [EGIDS] level.

Variants

According to Section 6, “Variants”, in [Proposal-Myanmar], this LGR defines following variants:

In-script variants: Variants are defined based on identical appearance or because they are language-based or otherwise analogues of the same code point or sequence (semantic variants).

Variant Dispositions: The disposition for some variants is “blocked” : only a single version of the label should be in the root-zone at one time, while all other variants are excluded. The disposition for the remaining in-script variants is “allocatable”, allowing more than one variant to be delegated to the same entity. See Section 6.1 in [Proposal-Myanmar].

Variants that have the same meaning, pronunciation and property should not appear both in the same string. Based on the language, only one variant should be chosen and written consistently. The LGR contains rules and other constraints on variants that prohibit arbitrary mixture of variants. See Section 7 in [Proposal-Myanmar].

Some additional code point combinations could create visual variants; however the WLE rules disallow these combinations. They are therefore not normatively defined as variants, but listed in Appendix A of [Proposal-Myanmar].

Cross-script variants:; Some Myanmar characters look the same as characters in Malayalam, Oriya and Georgian scripts. See Section 6.2 in [Proposal-Myanmar].

Additional Variants: This LGR inherits additional cross-script variants by integration; they may not be listed here unless they result in in-script variants. For consistency with other RZ-LGRs, cross-script variants to ASCII code points are listed explicitly as well. For the Malayalam See the merged, Common LGR [RZ-LGR-5] for details of all applicable cross-script variants, including any not listed here; always use the Common LGR for determining cross-script collisions of labels.

The specification of variants in the Root Zone LGR follows the guidelines in [RFC 8228].

Character Classes

The syllable principle is at the heart of the Myanmar script writing system. The general order of elements in a syllable is Consonant > (Medials) > Vowels > (Consonant) > Tone. Overall, the Myanmar script is composed of:

• Consonants (c). The following sub-categories of c are also defined:
  • c1, U+103F (GREAT SA, theoretical combination of two Myanmar Letter Sa)
  • c2, a set of consonants to be combined with S16
  • c3, a set of consonants to be combined with S17
• Independent Vowels (iv)
• Dependent Vowels (dv). Some of the dv also categorized to following sub-categories:
  • Long Vowel (lv): U+102B ( ါ), U+102C ( ာ), U+102E ( ီ), U+1030 ( ူ), U+1031 ( ေ), U+1032 ( ဲ), and U+1036 ( ံ) Anusvara
  • Short Vowel (sv): U+102D ( ိ), U+102F ( ု)
  • Anusvara (a): U+1036 ( ံ)
  • Shan Vowel (sh_vowel)
  • Long Tone (t_short)
  • Short Vowel (t_long)
• Killer or Asat (k)
• Virama (virama)
• Medials (m)
  • Mon medials (M_mon)
  • Shan medial (M_shan)
• Tone mark and Signs:
  • Shan Tone (sh_tone)
  • Pao Tone (pao_tone)
  • Sgaw Tone (skaw_tone)
• Other Various Signs (ov)

Consonants: Consonants usually stay at the head of each syllable. A consonant can be stand-alone or be followed by Medials, Dependent Vowels, other Signs or Tone Mark. A Consonant cannot be between Viramas to prevent the invalid case of c+v+c+v+c. See Section 3.3.1, “The Consonants” in [Proposal-Myanmar].

Independent Vowels: Only Burmese, Mon and Pa’O languages use Independent Vowels. An Independent Vowel can be at any position in a label. See Section 3.3.2, “The Independent Vowels” in [Proposal-Myanmar].

Dependent Vowels: Dependent vowel signs add vowel property to consonants. These signs appear in top/below/left/right positions of a center consonant or consonant+medial. The dotted-circle indicates where the centre character would be. Dependent vowel signs cannot be repeated and Dependent vowels cannot be adjacent to each other unless within sequences defined in Table 8-A. Dependent vowels also cannot be followed by Asat (U+1038) unless within sequences defined in Table 8-A. See Section 3.3.3, “The Diacritic - Dependent Vowels” of [Proposal-Myanmar].

Medials: Medials are used to enhance the sound of Consonants. They are also noted as Dependent Consonants as they need a leading Consonant to attach to. All five languages supported by this LGR use Medials. See Section 3.3.4, “Diacritic - Medials” of [Proposal-Myanmar].

Virama: U+1039 ( ္) MYANMAR SIGN VIRAMA is used in Burmese and Mon. Virama has two properties, as killer (devoweliser) and joiner of syllable chaining. This virama brings the consonant after it to be rendered below the consonant before. Pattern of syllable chaining : Consonant + Virama + Consonant. However. a repetition of Consonant + Virama + Consonant is not allowed to prevent rendering issues. See Section 3.3.5, “Diacritic - Tone Marks and Other Signs” in [Proposal-Myanmar].

Killer or Asat: U+103A ( ်) MYANMAR SIGN ASAT is used in all languages. This sign is used to remove the consonant sound of a letter and take only the vowel property to create more vowel sounds out of consonants. Except for defined sequences, Asat cannot follow other Diacritics. See Section 3.3.5, “Diacritic - Tone Marks and Other Signs” in [Proposal-Myanmar].

Long Tone (t_long): U+1038 ( း) MYANMAR SIGN VISARGA appears at the end of the syllable. It creates a vowel sound with the higher tone. It follows a Consonant, Medial, Long vowel or the sequence U+102D U+102F ( ို). See Section 3.3.5.1, “Burmese Tone Marks and Other Signs” in [Proposal-Myanmar].

Short Tone (t_short): MYANMAR SIGN DOT BELOW (U+1037) appears at the end of the syllable. It creates a vowel sound with the higher tone. It follows a Consonant, Medial, Long vowel or the sequence U+102D U+102F ( ို). See Section 3.3.5.1, “Burmese Tone Marks and Other Signs” in [Proposal-Myanmar].

Other classes defined for use in WLE and context rules

• Shan Tone (sh_tone), Shan Vowel (sh_vowel)
• C_103B, a set of consonants that can be followed by medial YA U+103B ( ျ)
• C_103C, a set of consonants that can be followed by medial RA U+103C ( ြ)
• C_103E, a set of consonants that can be followed by medial HA U+103E ( ှ)
• C_n103D, a set of consonants that cannot be followed by medial WA U+103D ( ွ)
• C_mon, a set of Mon consonants that can be followed by Mon Medial U+105E U+105F ( ၞၟ) or U+1060 ( ၠ)
• C_shan, a set of Mon consonants that can be followed by Shan medial WA U+1082 ( ႂ)
• CMM1, a set of consonants that can be followed by medial sequence U+103B U+103D ( ျွ)
• CMM3, a set of consonants that can be followed by medial sequence U+103C U+103D ( ြွ)
• CMM5, a set of consonants that can be followed by medial sequence U+103D U+103E ( ွှ)
• cp1002cp1015cp101D, a set of consonants that cannot be followed by vowel AA U+102C ( ာ)

Whole Label Evaluation (WLE) and Context Rules

Default Whole Label Evaluation Rules and Actions

The LGR includes the set of required default WLE rules and actions applicable to the Root Zone and defined in [MSR-5]. They are marked with ⍟. The default prohibition on leading combining marks is equivalent to ensuring that a label only starts with a consonant or independent vowel.

Myanmar-specific Rules

There are constraints on the context for many of the character classes in Myanmar. These constraints enforce the syllable structure to the degree needed for stability of rendering (which affects both security and usability) without enforcing other linguistic constraints or spellings. These constraints are implemented via a set of context and whole label rules formulated for LGR specification, as described in Section 7, “Whole Label Evaluation (WLE) Rules” in [Proposal-Myanmar].

The following shorthand names for sequences are used in the description or definition of these rules:

• S11 — Myanmar letter NGA followed by Asat and Virama (Kinzi)
• S12, S14, S15 — long-vowel sequences
• S16, S17 — Asat sequences
• ST4 — a Pa’O Karen tone sequence
• ST1, ST2, ST3 — Sgaw Karen tone sequences
• S_Mon4 — Mon Kinzi
• S_Mon5 - S_Mon16 — Mon dependent vowel sequences

The rules are:

1. dv: must follow c or m;
   Note dv includes lv, sv, and ov, as well as the starting code point in sequences S12, S13, S14, S15, S18, S19, S20, S_Mon3, S_Mon5, S_Mon6, S_Mon7, S_Mon8, S_Mon9, S_Mon10, S_Mon11, S_Mon12, S_Mon16, S_Sh1, S_Sh2, S_Sh3, S_Sh4, S_Sh5, S_Pao/.
2. Anusvara: must follow c or m
3. Rules for Medials combining with Consonants:
   • Rules for Single Medials
     • U+103B ( ျ) must follow consonant C_103B
     • U+103C ( ြ) must follow consonant C_103C
     • U+103E ( ှ) must follow consonant C_103E
     • U+103D ( ွ) must follow any consonant except C_n103D
     • M_mon must follow C_mon
     • M_shan must follow C_shan
   • Rules for Combined Medials
     • MM1 must follow CMM1
     • MM3 must follow CMM3
     • MM5 must follow CMM5
     • S_Mon13 must follow C_103E
     • S_Mon14 must follow C_103E
     • S_Mon15 must follow C_103E
4. U+103F (ဿ) MYANMAR GREAT SAA must follow c or m or dv or U+1023 (ဣ) or U+1025 (ဥ)
5. (c + k) or (c2 + S16) or (c3 + S17) must follow c or n or dv or ov
6. S11 must follow c or m or dv and another c must follow S11
7. virama: must be between two c (c+v+c). But c cannot be between v to prevent v+c+v+c
8. t_long and t_short: must follow c or m or lv or S12
9. sh_tone must follow sh_vowel or (c + k) or s_sh2 or s_sh5
10. pao_tone must follow dv or m or k, except U+1037 ( ့) or U+1038 ( း)
11. ST4 must follow U+1031 ( ေ), U+1032 ( ဲ), S12, S14, or S15
12. ST1, ST2, ST3 or Sgaw_Tone must follow c or m or dv
13. S_Mon4 must follow c or m or dv and another c must follow S_Mon4
14. U+102C ( ာ) cannot follow any of the three consonants U+1002 (ဂ), U+1015 (ပ), U+101D (ဝ)

These rules are implemented as required or prohibited contexts for the respective repertoire elements.

No-Mix Rules

According to Table 10 of [Proposal-Myanmar], there are code points which cannot occur both in the same label. The following WLE rules enforce these constraints:

• no-mix-mm-i-and-mm-ka-v-ka
• no-mix-mm-ha-asat-and-mm-pa-aa-asat
• no-mix-sk-sha-and-mm-ra-mha
• no-mix-mm-kha-and-shan-kha
• no-mix-mm-and-mon — the use of any mon-specific code point requires that all other code points that have a mon-specific equivalent must use that one over the standard Myanmar code point in that label.

These rules are implemented as WLE rules which trigger a corresponding action.

Context rules for Variants

The following prohibited context applies to certain variants:

• followed-by-c-end — a variant relation does not exist between U+1004 (င) and U+105A (ၚ) if followed by a consonant or end of label

In addition to preventing a variant in contexts where the two code point do not look the same, this means that unlike U+1004 (င), U+105A (ၚ) can never inherit a cross-script variant to Latin U+0063 (c), because it only takes on that appearance when followed by some other Myanmar-unique code point.

Myanmar-specific actions

The no-mix rules trigger Myanmar-specific actions that invalidate any original and variant labels not satisfying the constraints. See Section 7, “Whole Label Evaluation (WLE) Rules” in [Proposal-Myanmar].

In addition, to limit the number of allocatable variant labels, further constraints on variants are included. These allow allocatable variant labels to either contain members of Grapheme-set-1 (left column in Table 10) or Grapheme-set-2 (right column in Table 10) but not a mixture of members from both sets. The code points on the left column are either the simpler forms (shorter sequence) or the lower Unicode code point values. The mixture of code points from different sets, however, is possible in the original, applied-for label. See Section 6.1 “In-script Variants” in [Proposal-Myanmar].

Each code point or sequence in grapheme-set 1 has been given the reflexive variant type “r-set1” and each code point or sequence in grapheme-set 2 has been given the reflexive variant of type “r-set2”. (By convention, the prefix “r-” marks a type used in a reflexive variant mapping, that is, it represents an instance of the original code point at that location in a variant label, see Section 5.3.4 in [RFC 7940].)

A variant mapping from a member of grapheme-set 1 to a member of grapheme-set 2 is of type “set1-to- set2”, while the variant type for mapping from grapheme-set 2 to grapheme-set 1 is of type “set2-to-set1”.

Script-specific actions evaluate these variant types to ensure the following constraints:

• blocked — a variant label containing a blocked variant will receive a disposition of “blocked”.
• r-set1 r-set2 — a label containing one or more of these reflexive variant types and no others represents an original label and receives a disposition of “allocatable”.
• r-set1 set2-to-set1 — a label containing one or more of these variant types and no others receives a disposition of “allocatable”.
• r-set2 set1-to-set2 — a label containing one or more of these variant types and no others receives a disposition of “allocatable”.
• set1-to-set2 set2-to-set1 — a label containing a mix of these variant types receives a disposition of “blocked”.

See Section 6.1 “In-script Variants” and Section 7, “Whole Label Evaluation (WLE) Rules” in [Proposal-Myanmar].

Methodology and Contributors

The Root Zone LGR for the Myanmar script was developed by the Myanmar Generation Panel. For additional detail on methodology and contributors see Sections 4 and 8 in [Proposal-Myanmar], as well as [RZ-LGR-5-Overview].

References

[EGIDS]

Lewis and Simons, “EGIDS: Expanded Graded Intergenerational Disruption Scale,” documented in [SIL-Ethnologue] and summarized here:
https://en.wikipedia.org/wiki/Expanded_Graded_Intergenerational_Disruption_Scale_(EGIDS)

[Ethnologue]

Ethnologue, Myanmar, (Accessed 6 October 2019)
https://www.ethnologue.com/country/MM

[MSR-5]

Integration Panel, “Maximal Starting Repertoire — MSR-5 Overview and Rationale”, 24 June 2021,
https://www.icann.org/en/system/files/files/msr-5-overview-24jun21-en.pdf

[Proposal-Myanmar]

Myanmar Generation Panel, “Proposal for a Myanmar Script Root Zone Label Generation Rule-Set (LGR)”, 17 March 2022,
https://www.icann.org/en/system/files/files/proposal-myanmar-lgr-17mar22-en.pdf

[RFC 7940]

Davies, K. and A. Freytag, “Representing Label Generation Rulesets Using XML”, RFC 7940, August 2016,
https://www.rfc-editor.org/info/rfc7940.

[RFC 8228]

A. Freytag, “Guidance on Designing Label Generation Rulesets (LGRs) Supporting Variant Labels”, RFC 8228, August 2017,
https://www.rfc-editor.org/info/rfc8228

[RZ-LGR-5-Overview]

Integration Panel, “Root Zone Label Generation Rules (RZ LGR-5): Overview and Summary”, 26 May 2022,
https://www.icann.org/sites/default/files/lgr/rz-lgr-5-overview-26may22-en.pdf

[RZ-LGR-5]

Integration Panel, “Root Zone Label Generation Rules (RZ-LGR-5)”, 26 May 2022 (XML),
https://www.icann.org/sites/default/files/lgr/rz-lgr-5-common-26may22-en.xml
non-normative HTML presentation:
https://www.icann.org/sites/default/files/lgr/rz-lgr-5-common-26may22-en.html

[SIL-Ethnologue]

David M. Eberhard, Gary F. Simons & Charles D. Fennig (eds.). 2021. Ethnologue: Languages of the World, Twenty fourth edition. Dallas, Texas: SIL International. Online version available as
https://www.ethnologue.com

[Unicode 11.0]

The Unicode Consortium. The Unicode Standard, Version 11.0.0, (Mountain View, CA: The Unicode Consortium, 2018. ISBN 978-1-936213-19-1)
https://www.unicode.org/versions/Unicode11.0.0/

For more details for references [101] and up refer to the Table of References below.

Character Classes

Number of named classes	20
Implicit (except script)	10
Implict defined by script tag	5

The following table lists all named and implicit classes with their definition and a list of their members intersected with the current repertoire (for larger classes, this list is elided).

Name	Definition	Count	Members or Ranges	Ref	Comment
c	Tag=c	55	{1000-1022 1027 103F 105A-105D 1061 1075-1081}		Any Myanmar consonant
dv	Tag=dv	17	{102B-1034 1036-1038 1062 1083-1084 1086}		Any Myanmar dependent vowel
m	Tag=m	8	{103B-103E 105E-1060 1082}		Any Myanmar medial
ov	Tag=ov	3	{1035 1062 1085}		Any Myanmar other vowel sign
c2	Tag=c2	7	{1004 1009-100A 100F 1014 1019-101A}		Consonants that may precede S16
c3	Tag=c3	10	{1004 1009-100A 100F 1014 1019 101D 1075 107A 107C}		Consonants that may precede S17
lv	Tag=lv	7	{102B-102C 102E 1030-1032 1036}		Long Vowel: tall AA, AA, II, UU, E, AI and Anusvara
sh_vowel	Tag=sh_vowel	8	{102D-1031 1083-1084 1086}		Shan vowel
k	Tag=k	1	{103A}		The Myanmar Asat (killer)
virama	Tag=virama	1	{1039}		The Myanmar Virama
C_103B	Tag=C_103B	30	{1000-1004 1006 100F-101A 101C-101D 101F 105C 1075-1079 107B-107D}		Consonants that can be followed by U+103B ( ျ)
C_103C	Tag=C_103C	30	{1000-1004 1006 100F-1019 101F 1022 105C 1075-1079 107B-107D 107F-1080}		Consonants that can be followed by U+103C ( ြ)
C_103E	Tag=C_103E	15	{1004-1005 1009-100A 100F 1014 1019-1020 105C}		Consonants that can be followed by U+103E ( ှ)
C_n103D	Tag=C_n103D	7	{1008 103B-103C 105A-105B 105D 107E}		Consonants that cannot be followed by U+103D ( ွ)
C_mon	Tag=C_mon	32	{1000-1003 1005-1007 1009-100A 100F-1021 105A-105D}		Mon Consonants
C_shan	Tag=C_shan	25	{1001 1004 1010-1011 1015 1019-101E 1022 1075-1081}		Shan Consonants
CMM1	Tag=CMM1	27	{1000-1002 1010-101A 101C 101F 1022 1075-1079 107B-107D 107F-1080}		Consonants that can be followed by medial sequence U+103B U+103D ( ျွ)
CMM3	Tag=CMM3	15	{1000-1002 1004 1010-1019 101F}		Consonants that can be followed by medial sequence U+103C U+103D ( ြွ)
CMM5	Tag=CMM5	9	{1004 1009-100A 100F 1014 1019-101C}		Consonants that can be followed by medial sequence U+103D U+103E ( ွှ)
beforePaoTone-set	combined = [[:dv:] ∪ [:m:] ∪ [:k:]]	26	{102B-1034 1036-1038 103A-103E 105E-1060 1062 1082-1084 1086}		Code points that can be followed by Pao tone (Union of dc, m and k)
implicit	Tag=a	1	{1036}		The character tagged as a
implicit	Tag=c1	1	{103F}		The character tagged as c1
implicit	Tag=iv	8	{1023-102A}		Any character tagged as iv
implicit	Tag=M_mon	3	{105E-1060}		Any character tagged as M_mon
implicit	Tag=M_shan	1	{1082}		The character tagged as M_shan
implicit	Tag=pao_tone	2	{108F AA7B}		Any character tagged as pao_tone
implicit	Tag=sgaw_tone	1	{1064}		The character tagged as sgaw_tone
implicit	Tag=sh_tone	4	{1087-108A}		Any character tagged as sh_tone
implicit	Tag=t_long	1	{1038}		The character tagged as t_long
implicit	Tag=t_short	1	{1037}		The character tagged as t_short
implicit	Tag=sc:Geor	2	{10D7-10D8}		Any character tagged as Georgian
implicit	Tag=sc:Latn	2	{0063 006F}		Any character tagged as Latin
implicit	Tag=sc:Mlym	2	{0D20 0D31}		Any character tagged as Malayalam
implicit	Tag=sc:Mymr	98	{1000-103F 105A-1062 1064 1075-108A 108F AA7B}		Any character tagged as Myanmar
implicit	Tag=sc:Orya	2	{0B20 0B47}		Any character tagged as Oriya

Whole label evaluation and context rules

Number of rules	37
Used to trigger actions	6
Used as context rule (C)	24
Used as context rule (V)	2
Anchored context rules	25
Used only in another rule	6

The following table lists all named rules defined in the LGR and indicates whether they are used as trigger in an action or as context (when or not-when) for a code point or variant.

Name	Regular Expression	Used as Trigger	Anchor	Used as Context	Ref	Comment
leading-combining-mark	(start)[[\p{gc=Mn}] ∪ [\p{gc=Mc}]]	✔				Default WLE rule matching labels with leading combining marks ⍟
no-mix-mm-i-and-mm-ka-v-ka	(\u1023.*\u1000\u1039\u1000)|(\u1000\u1039\u1000.*\u1023)	✔				WLE Rule No Mix Pair 1: do not mix MYANMAR I and MYANMAR KA VIRAMA KA in the same label
no-mix-mm-ha-asat-and-mm-pa-aa-asat	(\u101F\u103A.*\u1015\u102C\u103A)|(\u1015\u102C\u103A.*\u101F\u103A)	✔				WLE Rule No Mix Pair 2: do not mix MYANMAR HA ASAT and MYANMAR PA AA ASAT in the same label
no-mix-sk-sha-and-mm-ra-mha	(\u1061.*\u101B\u103E)|(\u101B\u103E.*\u1061)	✔				WLE Rule No Mix Pair 3: do not mix SKAW KAREN SHA and MYANMAR RA medial-HA in the same label
no-mix-mm-and-mon	([\u1004\u1008\u102E].*[\u1033\u105A-\u105B])|([\u1033\u105A-\u105B].*[\u1004\u1008\u102E])	✔				WLE Rule No Mix Mon and Myanmar Pairs 4, 6. 8: do not mix Mon specific code point with any Myanmar code point that has a Mon equivalent in the same label
no-mix-mm-kha-and-shan-kha	(\u1001.*\u1076)|(\u1076.*\u1001)	✔				WLE Rule No Mix Pair 7: do not mix MYANMAR KHA and SHAN KHA in the same label
S12	\u102D\u102F					long vowel sequence, For WLE Rule #8, #11
S14	\u1031\u102B					long vowel sequence, For WLE Rule #11
S15	\u1031\u102C					long vowel sequence, For WLE Rule #11
S_Sh2	\u1031\u1083\u103A					dependent vowel sequence for Shan Language. (See 3.3.3.2 of [Proposal-Myanmar])
S_Sh5	\u1082\u103A					dependent vowel sequence for Shan Language. (See 3.3.3.2 of [Proposal-Myanmar])
follows-c-m	([:c:]|[:m:])← ⚓︎		✔	C		Section 7, WLE 1, 2: Some sets must follow C or M. The sets are DV, LV, SV, S12-S15, S18-S20, S_MON3, S_Sh1-S_Sh5, s_Pao, OV, Anusvara
follows-c_103B	([:C_103B:])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - U+103B ( ျ) must follow consonant C_103B
follows-c_103C	([:C_103C:])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - U+103C ( ြ) must follow consonant C_103C
follows-c_103E	([:C_103E:])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - U+103E ( ှ) must follow consonant C_103E
follows-c-except-c_n103D	([[:c:] ∖ [:C_n103D:]])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - U+103D ( ွ) must follow any consonant except C_n103D
follows-c_mon	([:C_mon:])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - M_mon must follow C_mon
follows-c_shan	([:C_shan:])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - U+1082 ( ႂ) must follow C_shan
follows-cmm1	([:CMM1:])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - MM1 must follow CMM1
follows-cmm3	([:CMM3:])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - MM3 must follow CMM3
follows-cmm5	([:CMM5:])← ⚓︎		✔	C		Section 7, WLE 3:Rules of Medials combining with Consonants - MM5 must follow CMM5
follows-c-m-dv-1023-1025	([:c:]|[:m:]|[:dv:]|\u1023|\u1025)← ⚓︎		✔	C		Section 7, WLE 4: The Myanmar Great Saa must follow C or M or DV or 1023 or 1025
follows-cc-mc-dvc-ovc	(([:c:][:c:])|([:m:][:c:])|([:dv:][:c:])|([:ov:][:c:]))← ⚓︎		✔	C		Section 7, WLE 5: C+K must follow C or M or DV or OV
follows-cc2-mc2-dvc2-ovc2	(([:c:][:c2:])|([:m:][:c2:])|([:dv:][:c2:])|([:ov:][:c2:]))← ⚓︎		✔	C		Section 7, WLE 5: C2+S16 must follow C or M or DV or OV
follows-cc3-mc3-dvc3-ovc3	(([:c:][:c3:])|([:m:][:c3:])|([:dv:][:c3:])|([:ov:][:c3:]))← ⚓︎		✔	C		Section 7, WLE 5: C3+S17 must follow C or M or DV or OV
follows-c-m-dv-and-followed-by-c	([:c:]|[:m:]|[:dv:])← ⚓︎ →([:c:])		✔	C		Section 7, WLE 6, 13: must follow C or M or DV and another C must follow
followed-by-c-end	⚓︎ →([:c:]|(end))		✔	V		Section 7.3: Variant is not defined if followed by C or end of label
between-c	([:c:])← ⚓︎ →([:c:])		✔	C		Section 7, WLE 7: Virama must be between two Cs (C+Virama+C)
between-virama	([:virama:])← ⚓︎ →([:virama:])		✔	C		Section7, WLE7: prohibited for C to prevent C+Virama+C_Virama
follows-or-precedes-virama	(([:virama:])← ⚓︎)|(⚓︎ →([:virama:]))		✔	C		Section7, WLE7: prohibited for some sequences to prevent override of WLE7
follows-c-m-lv-s12	([:c:]|[:m:]|[:lv:]|(:S12:))← ⚓︎		✔	C		Section 7, WLE 8: T_LONG(1037) or T_Short(1038) must follow C or M or LV or S12
ck	[:c:][:k:]					C followed by K, for WLE #9
follows-beforeShanTone-set	([:sh_vowel:]|(:ck:)|(:S_Sh2:)|(:S_Sh5:))← ⚓︎		✔	C		Section 7, WLE 9: Sh_Tone must follow Sh_Vowel or (C+K) or S_Sh2 or S_Sh5
follows-beforePaoTone-set-except-1037-1038	([[:beforePaoTone-set:] ∖ [\u1037-\u1038]])← ⚓︎		✔	C		Section 7, WLE 10: Pao_Tone must follow DV, M or K, except U+1037 ( ့) or U+1038 ( း)
follows-beforeST4-set	(\u1031|\u1032|(:S12:)|(:S14:)|(:S15:))← ⚓︎		✔	C		Section 7, WLE 11: ST4 must follow U+1031 ( ေ), U+1032 ( ဲ), S12, S14, S15
follows-c-m-dv	([:c:]|[:m:]|[:dv:])← ⚓︎		✔	C		Section 7, WLE 12: ST1, ST2, ST3 or Sgaw_Tone must follow C or M or DV
follows-c-m-except-1002-1015-101D	([:m:]|[[:c:] ∖ [\u1002\u1015\u101D]])← ⚓︎		✔	C, V		WLE 14: U+102C ( ာ) follows C or M except U+1002 (ဂ), U+1015 (ပ), U+101D (ဝ)

Actions

The following table lists the actions that are used to assign dispositions to labels and variant labels based on the specified conditions. The order of actions defines their precedence: the first action triggered by a label is the one defining its disposition.

#	Condition	Rule / Variant Set		Disposition	Ref	Comment
1	if label matches	leading-combining-mark	→	invalid		labels with leading combining marks are invalid ⍟
2	if at least one variant is in	{out-of-repertoire-var}	→	invalid		any variant label with a code point out of repertoire is invalid ⍟
3	if label matches	no-mix-mm-i-and-mm-ka-v-ka	→	invalid		do not mix MYANMAR I and MYANMAR KA VIRAMA KA in the same label
4	if label matches	no-mix-mm-ha-asat-and-mm-pa-aa-asat	→	invalid		do not mix MYANMAR HA ASAT and MYANMAR PA AA ASAT in the same label
5	if label matches	no-mix-sk-sha-and-mm-ra-mha	→	invalid		do not mix SKAW KAREN SHA and MYANMAR RA medial-HA in the same label
6	if label matches	no-mix-mm-kha-and-shan-kha	→	invalid		do not mix MYANMAR KHA and SHAN KHA in the same label
7	if label matches	no-mix-mm-and-mon	→	invalid		do not mix Mon specific code point with any Myanmar code point that has a Mon equivalent in the same label
8	if at least one variant is in	{blocked}	→	blocked		any variant label containing blocked variants is blocked ⍟
9	if each variant is in	{r-set1 r-set2}	→	valid		any original label is valid
10	if each variant is in	{r-set1 set2-to-set1}	→	allocatable		any label with all original and variant forms from grapheme-set 1 is allocatable
11	if each variant is in	{r-set2 set1-to-set2}	→	allocatable		any label with all original and variant forms from grapheme-set 2 is allocatable
12	if at least one variant is in	{set1-to-set2 set2-to-set1}	→	blocked		any variant label with a mix of variant forms is blocked
13	if each variant is in	{allocatable}	→	allocatable		variant labels with all variants allocatable are allocatable ⍟
14	if any label (catch-all)		→	valid		catch all (default action) ⍟