Maven goal jaxb2: xjc generating classes for wrappers tags

I have the following xml element:

<experiment>
    <name>Experiment</name>
    <globalVars>
        <var>
            <name>foo</name>
            <value>bar</value>
        </var>
    </globalVars>
    <!-- ... -->
</experiment>

Your match in schema is as follows:

<xs:element name="experiment">
  <xs:complexType>
    <xs:sequence>
      <xs:element type="xs:string" name="name"/>
      <xs:element name="globalVars">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="var" maxOccurs="unbounded" minOccurs="0">
              <xs:complexType>
                <xs:sequence>
                  <xs:element type="xs:string" name="name"/>
                  <xs:element type="xs:string" name="value"/>
                </xs:sequence>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
</xs:element>

After executing the goal% maven% with%, the following classes are generated:

public class Experiment {
    // ...
    @XmlElement(required = true)
    protected GlobalVars globalVars;
    // ...
}

public class GlobalVars {
    // ...
    protected List<Var> var;
    // ...   
}

public class Var {

    @XmlElement(required = true)
    protected String name;
    @XmlElement(required = true)
    protected String value;

    // ...
}

How do I make the jaxb2:xjc class not be generated and instead only one instance instance variable is generated? I want the output to look something like this:

public class Experiment {
    // ...
    @XmlElement(required = true)
    protected List<Var> globalVars;
    // ...
}