XML Schema + Namespace Issues

[Sean McCauliff]

I have a schema file where I define two complex types and one of the
complex types defines an element with the type of the other complex
type.  When I write an instance file the enclosed element is in an
empty namespace instead of being defined in the name space of the type
or of the enclosing element.  See instance_a.xml and schema_a.xsd
below.

schema_a.xsd
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";
          targetNamespace="http://eslug.net";
          xmlns="http://eslug.net";

 <xsd:complexType name="bType">
    <xsd:attribute name="anotherattr" type="xsd:string" use="required" />
  </xsd:complexType>

 <xsd:complexType name="aType">
    <xsd:sequence>
      <xsd:element name="b" type="bType" minOccurs="0" maxOccurs="unbounded" />
    </xsd:sequence>
    <xsd:attribute name="someattr" type="xsd:string" />
 </xsd:complexType>

 <xsd:element name="a" type="aType" />

</xsd:schema>

instance_a.xml
<blah:a xmlns:blah="http://eslug.net"; someattr="blah"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
       xsi:schemaLocation=
            "http://eslug.net file:schema_a.xsd"

 <!-- element b, below does not need to have the "blah:" ns prefix
inorder to be valid.
       It is in the empty namespace.
  -->
 <b anotherattr="blah" />
</blah:a>


If I change the schema so that the bType is defined as an element
instead.  Then "b" is not in the http://eslug.net namespace.

schema_b.xsd

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";
          targetNamespace="http://eslug.net";
          xmlns="http://eslug.net";

 <xsd:element name="b">
   <xsd:complexType >
    <xsd:attribute name="anotherattr" type="xsd:string" use="required" />
   </xsd:complexType>
 </xsd:element>

 <xsd:element name="a" >
   <xsd:complexType >
      <xsd:sequence>
        <xsd:element ref="b" maxOccurs="unbounded" />
      </xsd:sequence>
      <xsd:attribute name="someattr" type="xsd:string" />
   </xsd:complexType>
 </xsd:element>


</xsd:schema>

instance_b.xml
<blah:a xmlns:blah="http://eslug.net"; someattr="blah"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
       xsi:schemaLocation=
            "http://eslug.net file:schema_b.xsd"

 <!-- b is now in the correct namespace. -->
 <blah:b anotherattr="blah" />
</blah:a>

I would rather use schema a, but elements of "bType" only seem to show
up in the empty namespace forcing me to use schema_b.

Is this a bug or there some misunderstanding with how namespaces are
assigned to compexTypes in xml schema?

Thanks,
-Sean

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