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[namespace.future]
# 16 Library introduction [[library]](./#library)
## 16.4 Library-wide requirements [[requirements]](requirements#namespace.future)
### 16.4.5 Constraints on programs [[constraints]](constraints#namespace.future)
#### 16.4.5.2 Namespace use [[namespace.constraints]](namespace.constraints#namespace.future)
#### 16.4.5.2.3 Namespaces for future standardization [namespace.future]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3117)
Top-level namespaces whose [*namespace-name*](namespace.def.general#nt:namespace-name "9.9.2.1General[namespace.def.general]") consists of std followed by one or more [*digit*](lex.name#nt:digit "5.11Identifiers[lex.name]")*s* ([[lex.name]](lex.name "5.11Identifiers"))
are reserved for future standardization[.](#1.sentence-1)
The behavior of a C++ program is undefined if
it adds declarations or definitions to such a namespace[.](#1.sentence-2)
[*Example [1](#example-1)*:
The top-level namespace std2 is reserved
for use by future revisions of this International Standard[.](#1.sentence-3)
— *end example*]