Why IWSDLPublish interface is added to Win32 Delphi WebService - web-services

I've created a simple CGI application using Delphi 2009 that publishes a web service. When I point my web browser to the app, I can see my web service interface and another interface: IWSDLPublish.
Why is this interface added to my web service?
Do I need it?
Is it possible to not publish this interface?
Thanks.

That's what's used to display the WSDL for your interface. If you remove the WSDLPublish component, it should no longer publish that interface.

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Cheers
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