In which packages can an interface be extended?

Seems like an interface can only be extended in the package where it
was declared - is that correct?

//---
package main;
public interface ITest {}

//---
package vendor;
public interface IVendor {}

//---
package test;
import main;
import vendor;
interface main.ITest implements vendor.IVendor;


   >nicec test
   nice.lang: parsing
   main: parsing
   vendor: parsing
   test: parsing

   .\test\test.nice: line 6, column 39:
   Encountered ".".
   Was expecting:
       ";" ...


This works fine:
   package vendor;
   import main;
   interface main.ITest implements IVendor;


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