How do I use a bindings file when working with a wsdl?

[end-user]

I have a wsdl file that I can generate objects from just fine with the plugin when I don't try to provide a bindings file. However, because the schema is inside it I'm unable to point to the node for manipulation.
For example:

<wsdl:definitions ...>
  <wsdl:types>
    <xsd:schema targetNamespace="urn:example">
      <xsd:element ...

My bindings file:

<bindings xmlns="http://java.sun.com/xml/ns/jaxb">
    <bindings node="//xsd:schema/xsd:element">
        <schemaBindings>
            <nameXmlTransform>
                <elementName suffix="Header"/>
            </nameXmlTransform>
        </schemaBindings>
    </bindings>
</bindings>

throws a SAXParseException2, XPath evaluation of "//xsd:schema/xsd:element" results in empty target node Can you give an example of how you would attach a bindings file to a wsdl? While, in my example I'm trying to alter the generated class name, this also relates to the page on package binding.