Inconsistent namespace for imported groups

Before the long explanation, I'm importing a group from one namespace
into another, and I'm getting elements in different namespaces
depending on whether I compile 2 schemas together at once or first one,
and then the second with the results of the first on the classpath for
the compilation of the second. The schemas are identical for the two
compilation methods.

I'm really mystified by the following behavior and wonder if it is a
bug.

I have a small schema geronimo-naming.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
targetNamespace="http://geronimo.apache.org/xml/ns/naming"
xmlns:gernaming="http://geronimo.apache.org/xml/ns/naming"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified"
version="1.0">

<xsd:group name="jndiEnvironmentRefsGroup">
<xsd:sequence>
<xsd:element name="ejb-ref"
type="gernaming:remote-refType"
minOccurs="0" maxOccurs="unbounded"/>
<xsd:element name="ejb-local-ref"
type="gernaming:local-refType"
minOccurs="0" maxOccurs="unbounded"/>
<xsd:element name="resource-ref"
type="gernaming:local-refType"
minOccurs="0" maxOccurs="unbounded"/>
<xsd:element name="resource-env-ref"
type="gernaming:local-refType"
minOccurs="0" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:group>

(types for remote and local-ref ommitted)

</xsd:schema>

that is imported into another schema

<xs:import namespace="http://geronimo.apache.org/xml/ns/naming"
schemaLocation="../../../naming/src/schema/geronimo-naming.xsd"/>

and referenced like this:

<xs:complexType name="application-clientType">
<xs:sequence>
(some elements ommitted)
<xs:group ref="naming:jndiEnvironmentRefsGroup"/>
(more elements ommitted)
</xs:sequence>
</xs:complexType>

I compile types for the geronimo-naming schema separately.
-----------------------------------

I can compile the types for the referencing application-client schema
in two ways, with and without the precompiled geronimo-naming schema
classes on the classpath.

If I compile without the separately compiled classes, xmlbeans
generates additional copies of these classes that behave as I expect,
namely the resulting document fragments look like this:

<xml-fragment parentId="parentId" configId="configId"
xmlns:nam="http://geronimo.apache.org/xml/ns/naming">
<nam:resource-ref>
<nam:ref-name>ref</nam:ref-name>
<nam:target-name>target</nam:target-name>
</nam:resource-ref>
</xml-fragment>

Note that as expected thhe resource-ref element is in the nam namespace.

However, if I include the precompiled schema classes on the classpath
when generating xmlbeans code, I get the following fragments:

<xml-fragment parentId="parentId" configId="configId"
xmlns:nam="http://geronimo.apache.org/xml/ns/naming">
<resource-ref>
<nam:ref-name>ref</nam:ref-name>
<nam:target-name>target</nam:target-name>
</resource-ref>
</xml-fragment>

Note that resource-ref is in no namespace.

Can anyone explain this? Is there any way to get the "with-namespace"
behavior using the separately compiled classes?

I'm using xbean-1.0-DEV from the ibiblio maven repository.