qname resolution question

Hi,

I am wondering if the following schema is valid or not.
(I tend to think it is invalid.)

Both XSV and xerces passes validation with it.

What is the namespace name for the "documentBody"
qname below? Is it "http://www.w3.org/2001/XMLSchema",
or is it none (as targetNamespace is not provided)?

Thanks in advance.


<?xml version ="1.0"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" >

  <element name = "envelope">
    <complexType>
      <sequence>
        <element ref = "documentBody"/>
      </sequence>
    </complexType>
  </element>

  <element name = "documentBody" type="anyType"/>
  
</schema>

-Takuki Kamiya