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cppdraft/uaxid/def.md

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+[uaxid.def]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.2 R1 Default identifiers [uaxid.def]
+
+### [E.2.1](#general) General [[uaxid.def.general]](uaxid.def.general)
+
+[1](#general-1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L24)
+
+UAX #31 specifies a default syntax for identifiers
+based on properties from the Unicode Character Database, UAX #44[.](#general-1.sentence-1)
+
+The general syntax is
+
+```
+<Identifier> := <Start> <Continue>* (<Medial> <Continue>+)*
+
+```
+ where <Start> has the XID_Start property,<Continue> has the XID_Continue property, and<Medial> is a list of characters permitted between continue characters[.](#general-1.sentence-2)
+
+For C++ we add the character U+005f low line, or _,
+to the set of permitted <Start> characters,
+the <Medial> set is empty, and
+the <Continue> characters are unmodified[.](#general-1.sentence-3)
+
+In the grammar used in UAX #31, this is
+
+```
+<Identifier> := <Start> <Continue>*
+<Start> := XID_Start + U+005f
+<Continue> := <Start> + XID_Continue
+
+```
+
+[2](#general-2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L45)
+
+This is described in the C++ grammar in [[lex.name]](lex.name "5.11 Identifiers"),
+where [*identifier*](lex.name#nt:identifier "5.11 Identifiers [lex.name]") is formed from[*identifier-start*](lex.name#nt:identifier-start "5.11 Identifiers [lex.name]") or[*identifier*](lex.name#nt:identifier "5.11 Identifiers [lex.name]") followed by [*identifier-continue*](lex.name#nt:identifier-continue "5.11 Identifiers [lex.name]")[.](#general-2.sentence-1)
+
+### [E.2.2](#stable) R1b Stable identifiers [[uaxid.def.stable]](uaxid.def.stable)
+
+[1](#stable-1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L53)
+
+An implementation of UAX #31 may choose to guarantee
+that identifiers are stable across versions of the Unicode Standard[.](#stable-1.sentence-1)
+
+Once a string qualifies as an identifier it does so in all future versions[.](#stable-1.sentence-2)
+
+[2](#stable-2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L58)
+
+C++ does not make this guarantee,
+except to the extent that UAX #31 guarantees
+the stability of the XID_Start and XID_Continue properties[.](#stable-2.sentence-1)

cppdraft/uaxid/def/general.md

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+[uaxid.def.general]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.2 R1 Default identifiers [[uaxid.def]](uaxid.def#general)
+
+### E.2.1 General [uaxid.def.general]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L24)
+
+UAX #31 specifies a default syntax for identifiers
+based on properties from the Unicode Character Database, UAX #44[.](#1.sentence-1)
+
+The general syntax is
+
+```
+<Identifier> := <Start> <Continue>* (<Medial> <Continue>+)*
+
+```
+ where <Start> has the XID_Start property,<Continue> has the XID_Continue property, and<Medial> is a list of characters permitted between continue characters[.](#1.sentence-2)
+
+For C++ we add the character U+005f low line, or _,
+to the set of permitted <Start> characters,
+the <Medial> set is empty, and
+the <Continue> characters are unmodified[.](#1.sentence-3)
+
+In the grammar used in UAX #31, this is
+
+```
+<Identifier> := <Start> <Continue>*
+<Start> := XID_Start + U+005f
+<Continue> := <Start> + XID_Continue
+
+```
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L45)
+
+This is described in the C++ grammar in [[lex.name]](lex.name "5.11 Identifiers"),
+where [*identifier*](lex.name#nt:identifier "5.11 Identifiers [lex.name]") is formed from[*identifier-start*](lex.name#nt:identifier-start "5.11 Identifiers [lex.name]") or[*identifier*](lex.name#nt:identifier "5.11 Identifiers [lex.name]") followed by [*identifier-continue*](lex.name#nt:identifier-continue "5.11 Identifiers [lex.name]")[.](#2.sentence-1)

cppdraft/uaxid/def/stable.md

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+[uaxid.def.stable]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.2 R1 Default identifiers [[uaxid.def]](uaxid.def#stable)
+
+### E.2.2 R1b Stable identifiers [uaxid.def.stable]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L53)
+
+An implementation of UAX #31 may choose to guarantee
+that identifiers are stable across versions of the Unicode Standard[.](#1.sentence-1)
+
+Once a string qualifies as an identifier it does so in all future versions[.](#1.sentence-2)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L58)
+
+C++ does not make this guarantee,
+except to the extent that UAX #31 guarantees
+the stability of the XID_Start and XID_Continue properties[.](#2.sentence-1)

cppdraft/uaxid/eqci.md

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+[uaxid.eqci]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.6 R5 Equivalent case-insensitive identifiers [uaxid.eqci]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L100)
+
+This document considers case to be significant in identifier comparison, and
+does not do any case folding[.](#1.sentence-1)
+
+This requirement from UAX #31 does not apply to this document[.](#1.sentence-2)

cppdraft/uaxid/eqn.md

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+[uaxid.eqn]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.5 R4 Equivalent normalized identifiers [uaxid.eqn]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L89)
+
+UAX #31 requires that implementations describe
+how identifiers are compared and considered equivalent[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L93)
+
+This document requires that identifiers be in Normalization Form C and
+therefore identifiers that compare the same under NFC are equivalent[.](#2.sentence-1)
+
+This is described in [[lex.name]](lex.name "5.11 Identifiers")[.](#2.sentence-2)

cppdraft/uaxid/filter.md

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+[uaxid.filter]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.7 R6 Filtered normalized identifiers [uaxid.filter]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L107)
+
+If any characters are excluded from normalization,
+UAX #31 requires a precise specification of those exclusions[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L111)
+
+This document does not make any such exclusions[.](#2.sentence-1)

cppdraft/uaxid/filterci.md

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+[uaxid.filterci]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.8 R7 Filtered case-insensitive identifiers [uaxid.filterci]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L116)
+
+C++ identifiers are case sensitive, and
+therefore this requirement from UAX #31 does not apply[.](#1.sentence-1)

cppdraft/uaxid/general.md

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+[uaxid.general]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.1 General [uaxid.general]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L6)
+
+This Annex describes the choices made in application of
+UAX #31 (“Unicode Identifier and Pattern Syntax”)
+to C++ in terms of the requirements from UAX #31 and
+how they do or do not apply to this document[.](#1.sentence-1)
+
+In terms of UAX #31,
+this document conforms by meeting the requirements
+R1 “Default Identifiers” and
+R4 “Equivalent Normalized Identifiers” from UAX #31[.](#1.sentence-2)
+
+The other requirements from UAX #31, also listed below,
+are either alternatives not taken or do not apply to this document[.](#1.sentence-3)

cppdraft/uaxid/hashtag.md

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+[uaxid.hashtag]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.9 R8 Hashtag identifiers [uaxid.hashtag]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L122)
+
+There are no hashtags in C++, so this requirement from UAX #31 does not apply[.](#1.sentence-1)

cppdraft/uaxid/immutable.md

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+[uaxid.immutable]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.3 R2 Immutable identifiers [uaxid.immutable]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L65)
+
+An implementation may choose to guarantee that
+the set of identifiers will never change
+by fixing the set of code points allowed in identifiers forever[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L70)
+
+C++ does not choose to make this guarantee[.](#2.sentence-1)
+
+As scripts are added to Unicode,
+additional characters in those scripts may become available
+for use in identifiers[.](#2.sentence-2)

cppdraft/uaxid/pattern.md

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+[uaxid.pattern]
+
+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.4 R3 Pattern_White_Space and Pattern_Syntax characters [uaxid.pattern]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L78)
+
+UAX #31 describes how formal languages
+such as computer languages should describe and implement
+their use of whitespace and syntactically significant characters
+during the processes of lexing and parsing[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L84)
+
+This document does not claim conformance with this requirement from UAX #31[.](#2.sentence-1)