Mutual import

Dear mail group members.

I eventually found that no xml schema validators available to me (including 
xmlspy, visual studio and online validators) let two xml schemas to import 
each other mutually. (The validator on w3.org crushes with it.)

Trying to look into the problem, I found the topic 
http://lists.w3.org/Archives/Public/xmlschema-dev/2001Jun/0172.html in which 
it is stated that mutual importing is allowed.

So, is it allowed for schemas A for namespace AA and B for namespace BB to 
import each other mutually in the following maner?

A.xsd:
....
<xs:schema targetNamespace="AA" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:import namespace="BB" schemaLocation="B.xsd"/>
....

B.xsd:
....
<xs:schema targetNamespace="BB" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:import namespace="AA" schemaLocation="A.xsd"/>
....