How to overrides the default WCF behaviour by embedding and XSD documents

How we can retrieve WSDL and overrides the default WCF behavior by embedding XSD documents that are referenced by the WSDL documents?

I'm trying to achieve this by implementing: IWsdlExportExtension, IEndpointBehavior, and by adding logic to manipulate the WSDL in the ExportEndpoint method.

public void ExportEndpoint(WsdlExporter exporter, WsdlEndpointConversionContext context)

Question: How we can invoke this custom class which implements the IWsdlExportExtension, IEndpointBehavior in core WCF?