[sv-cc] vpiPortInst from interface

Hi,
I have question about vpiPortInst and vpiInterface
According to LRM I can iterate via vpiPortInst from Variables, but what
about interface?
 
Example:
 
interface simple ;
...
 
endinterface
 
module top();
simple i();
 
child1 i1(i);
child2 i2(i);

endmodule 
 
module child1 (interface x);
...
module child2 (interface y);
..
 
 
I have handle to top.i . How can I receive handles to ports x and y ?  If
interface is on port I have vpiRefObj and I can do it. 
 
Regards,
Radek
 

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