title: XSD namespace "ns2" issue
body: <p>I have schema defined in Request.xsd which will refer common.xsd.
  I'm expecting the output should come as below</p>
  
  <pre><code>&lt;Request xmlns="http://ws.myref.com/schemas/test" 
          xmlns="http://ps.myref.com/schemas/2008/Common"&gt;
   &lt;EmailList&gt;
       &lt;Mail&gt;test@gmail.com&lt;/Mmail&gt;
    &lt;/EmailList&gt;
  &lt;/Request&gt;
  </code></pre>
  
  <p>But i'm getting extra namespace "ns2" issue. Can anybody help me out to resolve this issue  </p>
  
  <pre><code>&lt;ns2:Request xmlns:ns2="http://ps.myref.com/schemas/test" 
               xmlns="http://ps.myref.com/schemas/Common"&gt;
      &lt;ns2:EmailList&gt;
         &lt;Mail&gt;test@gmail.com&lt;/Mail&gt;
      &lt;/ns2:EmailList&gt;
  &lt;/ns2:Request&gt;
  </code></pre>
  
  <p>Request.xsd</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
              elementFormDefault="qualified" targetNamespace="http://ps.myref.com/schemas/schemas/test"
              xmlns="http://ps.myref.com/schemas/schemas/test" xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
              xmlns:com="http://ps.myref.com/schemas/Common"&gt;
      &lt;xsd:import namespace="http://ps.myref.com/schemas/Common" schemaLocation="../schemas/common/common.xsd"/&gt;
      &lt;xsd:element name="Request"&gt;
          &lt;xsd:complexType&gt;
              &lt;xsd:sequence&gt;
                  &lt;xsd:element name="EmailLists" type="com:EmailList" minOccurs="0" maxOccurs="1"/&gt;
              &lt;/xsd:sequence&gt;
          &lt;/xsd:complexType&gt;
      &lt;/xsd:element&gt;
  &lt;/xsd:schema&gt;
  </code></pre>
  
  <p>Common.xsd</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  &lt;xsd:schema xmlns="http://ps.myref.com/schemas/2008/Common" elementFormDefault="unqualified"
              targetNamespace="http://ps.myref.com/schemas/Common"
              xmlns:xsd="http://www.w3.org/2001/XMLSchema"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt;
      &lt;xsd:complexType name="EmailList"&gt;
          &lt;xsd:sequence&gt;
              &lt;xsd:element name="Mail" type="xsd:string" minOccurs="0" maxOccurs="unbounded"/&gt;
          &lt;/xsd:sequence&gt;
      &lt;/xsd:complexType&gt;
  &lt;/xsd:schema&gt;
  </code></pre>