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cppdraft/uaxid/def/stable.md

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+[uaxid.def.stable]
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+# 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)