Avoid Empty Sub-Tags in XML if everything is blank in an object

We have JAXB objects marshing/unmarshalling XML. Currently, we get this tag, even though everything inside it is empty. We need to completely get rid of the Top section if all its sub-elements are empty. (If at least one is not empty, it should exist.)

    <ns2:Top>
        <ns2:OrganizationName></ns2:OrganizationName>
        <ns2:Address>
            <ns2:Street1></ns2:Street1>
            <ns2:Street2></ns2:Street2>
            <ns2:City></ns2:City>
            <ns2:ZipPostalCode></ns2:ZipPostalCode>
        </ns2:Address>
    </ns2:Top>

The JAXB class is defined as:

    @XmlElement(name = "Top")
    protected Top top;