Defining A namespace
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The grammar for defining a namespace is
original-namespace-name: identifier namespace-definition: original-namespace-definition extension-namespace-definition unnamed-namespace-definition
Grammatically, there are three ways to define a namespace with the namespace keyword:
original-namespace-definition:
namespace identifier { namespace-body }
extension-namespace-definition:
namespace original-namespace-name { namespace-body }
unnamed-namespace-definition:
namespace { namespace-body }
The body is an optional sequence of declarations. The grammar is
namespace-body: declaration-seq opt