All qualified names (A::B::C) are translated during compile-time.
<?php
use eZ::Database::Driver as Driver;

// translated at compile-time to eZ::Database::Driver::Sqlite()
new Driver::Sqlite(); 
?>



All unqualified names (C) are translated during compile-time.
<?php
use eZ::Database::Driver;

// translated at compile-time to eZ::Database::Driver()
new Driver();
?>