[sv-cc] Name of t/f vpiRefObj

Hello,
I have problem with LRM interpretation.
SV example:
 
module top;
bit b;
 
task automatic tsk(ref x);
$vpi(x);
endtask
 
initial 
    tsk(b);
endmodule
 
From $vpi argument:
 
vpiType == vpiRefObj
vpiName == x
vpiDefName == b
 
And vpiActual relation gives be :
vpiBitVar with vpiName == b 
 
Am I right?
Or maybe if $vpi argument should be vpiName ==b , vpiType ==vpiBitVar?
 
And 2nd question:
 
 If I pass variables via few ref's vpiActual should return the near
vpiRefObj or vpiVariable from top layer ?
 
Regards,
Radek
 

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