Description:
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It seems to me that http://www.php.net/manual/en/language.namespaces.importing.php
is supposed to be the main documentation of the 'use' keyword for importing
namespaces.
If that's the case, it is woefully inadequate.
Please, look at the language references for any other modern language, and 
add some documentation on the scope of the operator.
Does it have till-end-of-current-file scope? or is it block-scoped? If a file is included, using 'include' for example, is the outer code affected by the 'use' statements within the include.

The same questions go for the namespace operator itself. 

If I do this, to protect users of my library from name clashes:

namespace MyLibrary {

 use AnotherLibrary;

//my library.

}

is only code within the {} affected by the 'use'?
or does code that includes my php file suddendly have AnotherLibrary
also added to their toplevel namespace? or do they have MyLibrary\AnotherLibrary ?

Unless you properly document this, people have to try to make reasonable guesses about these things, or find them out by trial and error.

ie by not documenting it you just leaving it as 'implementation dependent'. 

If there is some other more canonical reference about the language, please add links to it in the manual above!