tmp/tmpzasezwz8/{from.md → to.md}
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### Namespace alias <a id="namespace.alias">[[namespace.alias]]</a>
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A *namespace-alias-definition* declares
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``` bnf
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namespace-alias:
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identifier
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```
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``` bnf
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namespace-alias-definition:
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namespace identifier '=' qualified-namespace-specifier ';'
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```
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``` bnf
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qualified-namespace-specifier:
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nested-name-specifierₒₚₜ namespace-name
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```
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The *identifier* in a *namespace-alias-definition* becomes a
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*namespace-alias*
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[*Note 1*: When looking up a *namespace-name* in a
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*namespace-alias-definition*, only namespace names are considered, see
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[[basic.lookup.udir]]. — *end note*]
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### Namespace alias <a id="namespace.alias">[[namespace.alias]]</a>
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A *namespace-alias-definition* declares a *namespace alias* according to
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the following grammar:
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``` bnf
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namespace-alias:
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identifier
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```
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``` bnf
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namespace-alias-definition:
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namespace identifier '=' qualified-namespace-specifier ';'
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namespace identifier '=' splice-specifier ';'
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```
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``` bnf
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qualified-namespace-specifier:
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nested-name-specifierₒₚₜ namespace-name
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```
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The *splice-specifier* (if any) shall designate a namespace that is not
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the global namespace.
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The *identifier* in a *namespace-alias-definition* becomes a
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*namespace-alias*.
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The underlying entity [[basic.pre]] of the namespace alias is the
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namespace either denoted by the *qualified-namespace-specifier* or
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designated by the *splice-specifier*.
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[*Note 1*: When looking up a *namespace-name* in a
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*namespace-alias-definition*, only namespace names are considered, see
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[[basic.lookup.udir]]. — *end note*]
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