** Synopsis **

    :   '''`[namespace] qualifiers`''' ''string''



** Description **

'''`namespace qualifiers`''' is the complement of `[namespace tail]`. It
returns the leading namespace qualifiers for ''string'', or, when ''string'' is
`::`, the [empty string].  Qualifiers are namespace names separated by `::`.
The operation of `namespace qualifiers` is purely lexical.  It does not check
whether the namespace names exist.



** Examples **

The value of

======
namespace qualifiers ::foo::bar::x
======

is

======none
::foo::bar
======



** See Also **

   [namespace]:   

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