for _, vs := range virtualServices {
		v := vs.Spec.(*networking.VirtualService)
		for _, h := range v.Hosts {
			// We may have duplicate (not just overlapping) hosts; assume the list of VS is sorted already
			// and never overwrite existing entries
			if host.Name(h).IsWildCarded() {
				_, exists := wildcardVirtualServiceHostIndex[host.Name(h)]
				if !exists {

			sets.New("a"),
			false,
		},
		{ // no duplicates, no overlap
			[]string{"a", "b"},
			[]string{"c", "d"},
			sets.New("a", "b", "c", "d"),
			false,
		},
		{ // some duplicates, with some overlapping duplicates
			[]string{"a", "b", "a"},
			[]string{"c", "b"},
			sets.New("a", "b", "c"),
			false,
		},
		{ // empty list in CLI, but 'all' present in config file
			[]string{},
			[]string{"all"},

	//
	// In the second case, multiple services may be implemented by the same physical port number,
	// though with a different ServicePort and IstioEndpoint for each.  If any of these overlapping
	// services are not HTTP or H2-based, behavior is undefined, since the listener may not be able to
	// determine the intended destination of a connection without a Host header on the request.

        return DocumentOverlayResult(resultDocument, overlayOriginContainer, overlayResolutionContainer)
    }
}


/**
 * Represents the results of overlaying declarative documents.
 * * [document] is the resulting document content;
 * * [overlayNodeOriginContainer] tells where a node comes from – overlay, underlay, or combined.