problem with schema and complexType

[Cedric Roux]

Hi Xerces,

I have a problem.

The following schema (work.xsd) "works":

---------
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
           xmlns:ln="http://foo";
           targetNamespace="http://foo";>

<xs:element name="foo">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="bar" form="qualified" type="ln:barType">
      </xs:element>
      <xs:element name="bar" form="qualified" type="ln:barType">
      </xs:element>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<xs:complexType name="barType"/>

</xs:schema>
---------

Running "DOMPrint -n -s test-work.xml" with the following
file (test-work.xml) produces good output.

---------
<?xml version="1.0" encoding="UTF-8"?>

<foo xmlns="http://foo";
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
     xsi:schemaLocation="http://foo work.xsd" >
  <bar/>
  <bar/>
</foo>
---------

But the following schema (dont-work.xsd) does not "work".

---------
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
           xmlns:ln="http://foo";
           targetNamespace="http://foo";>

<xs:element name="foo">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="bar" form="qualified">
        <xs:complexType />
      </xs:element>
      <xs:element name="bar" form="qualified">
        <xs:complexType />
      </xs:element>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<xs:complexType name="barType"/>

</xs:schema>
---------

With the following file (test-dont-work.xml) it fails
with the error:
Error at file "[...]/dont-work.xsd", line 12, column 47
   Message: element 'bar' declared more than once in the same scope

---------
<?xml version="1.0" encoding="UTF-8"?>

<foo xmlns="http://foo";
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
     xsi:schemaLocation="http://foo dont-work.xsd" >
  <bar/>
  <bar/>
</foo>
---------

On the other hand, the xmllint program from libxml is happy with both.

The only difference between the two schemas is that the first one
refers to a global empty complexType while the second schema embeds
the complexType.

Sorry for the vocabulary, this is all new to me.

So what do I do wrong? Is xerces (3.1.1) correct here?
(please, tell me it's a bug, my schemas are complex and
I can't extract the complexType as I did for this tiny
test case! I also need to put several elements the one
after the other, in my real case attributes differ and
many other little tiny details, I can't use minOccurs...).

Regards,
Cédric.