Web.xml and web service

In a web.xml file there is a section:
*<service-ref>*
<service-ref-name>xxxx</service-ref-name>
<service-interface>x</service-interface>
<wsdl-file>WEB-INF/x.wsdl</wsdl-file>
<jaxrpc-mapping-file>WEB-INF/x.xml</jaxrpc-mapping-file>
<port-component-ref>
<service-endpoint-interface>xxxxxxxx</service-endpoint-interface>
</port-component-ref>
*</service-ref>*
I have two questions:
1)To use web service, is this section mandatory or optional?
2)If optional, what is this section used for?
Thanks
Scott

With JAX-WS this is not required.

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After further investigation: -
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This should fix your problem :)
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Web.xml and web service

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