From 91c4852fdf7bb750be3e6e264fe6e49d4c109a5f Mon Sep 17 00:00:00 2001
From: Jens Maurer <Jens.Maurer@gmx.net>
Date: Tue, 18 Feb 2020 23:39:31 +0100
Subject: [PATCH] P1908R1 Reserving attribute namespaces for future use

---
 source/declarations.tex | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/source/declarations.tex b/source/declarations.tex
index 35cc98100a..cdee097a25 100644
--- a/source/declarations.tex
+++ b/source/declarations.tex
@@ -8540,6 +8540,14 @@
 behavior is \impldef{behavior of non-standard attributes}.
 Any \grammarterm{attribute-token} that is not recognized by the implementation
 is ignored.
+An \grammarterm{attribute-token} is reserved for future standardization if
+\begin{itemize}
+\item it is not an \grammarterm{attribute-scoped-token} and
+not specified in this document, or
+\item it is an \grammarterm{attribute-scoped-token} and
+its \grammarterm{attribute-namespace} is
+either \tcode{std} or \tcode{std} followed by one or more digits.
+\end{itemize}
 \begin{note}
 Each implementation should choose a distinctive name for the
 \grammarterm{attribute-namespace} in an \grammarterm{attribute-scoped-token}.