For jaxrpc/ee/wsi/document/literal/marshalltest/Client.java#MarshallComplexTypesTest

The schema type is

<complexType name="Document">
<simpleContent>
<extension base="string">
<xsd:attribute
name="ID"
type="string"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"/>
</extension>
</simpleContent>
</complexType>

the log shows

<complexType name='Document'>
<complexContent>
<extension base='string'>
<sequence/>
</extension>
</complexContent>
</complexType>