How to add Schema to Types with wsdl4j or JWSDL

I try to implement a WSDL auto-generator with JWSDL or wsdl4j. here is one part of the wsdl file that I want to create:

<types>
    <xsd:schema targetNamespace="http://ift.tt/1FZUkt3">
        <xsd:import namespace="http://soc4crowd/cws"
            schemaLocation="cws.xsd" />

        <xsd:element name="manualTestingInput" type="cws:ccw" />
        <xsd:element name="manualTestingOutput" type="cws:ccw" />
    </xsd:schema>
</types>

Can anyone tell me how to implement this types when generating a wsdl file with JWSDL or wsdl4j? Thanks