title: remove under scores in java files generated using xjc command
body: <p>I have the following lines in my xsd schema</p>
  
  <pre><code>&lt;simpleType name="IdTypeEnum"&gt;
      &lt;restriction base="token"&gt;
      &lt;enumeration value="SIP1"&gt;&lt;/enumeration&gt;
          &lt;enumeration value="SIP2"&gt;&lt;/enumeration&gt;
  </code></pre>
  
  <p>In generated java files, I have the following code</p>
  
  <pre><code>@XmlEnumValue("SIP2")
  SIP_2("SIP2"),
  @XmlEnumValue("CUSIP3")
  SIP_3("SIP3"),
  </code></pre>
  
  <p>I want to remove the underscores in generated java files so that the above code looks like this </p>
  
  <pre><code> @XmlEnumValue("SIP2")
  SIP2("SIP2"),
  @XmlEnumValue("CUSIP3")
  SIP3("SIP3"),
  </code></pre>
  
  <p>Is there any way in which we can tweak the xjc command so that it generates java files in above manner?</p>
  
  <p>My schema uses <code>elementFormDefault="qualified"</code></p>