>  a) I was talking about namespace name "A_B" not class/function name.

_ is legal identifier character, so it would not be a good idea to use 
it as a separator. :: on the other side is natural scope separator in 
many languages. But I'm rather reluctant to start the "my separator is 
better than yours" thread for the 42th time :)

>  b) So as far as I understand "import" doesn't actually *import* names
>  from specified
>  namespace to the current one but just renames long namespace name to a
>  shorter one. And if I get it right the separator in the namespace name
>  is allowed
>  and required only to express default name when importing without "as".
>  Am I right?

Not exactly. It does import, but not names just one name - the very same 
name it has as an argument. The :: is used to join components of the 
name. Note that you can also do:

import Foo::XML as myXML;
$a = new myXML::Data::Document();

if you wish so.
-- 
Stanislav Malyshev, Zend Software Architect
stas@[...].com   http://www.zend.com/
(408)253-8829   MSN: stas@[...].com

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