cannot resolve method transform in waf 6.1 developer guide

hi,

I'm using waf 6.1 & cms 6.1 i've created a application ,in my servlet i'm using the following code
but i'm not able to resolve from which package transform(sreq, sresp, doc); method is taken.
Can anyone suggest which package i have to import for this method.
 
the below code is in waf 6.1 developer guide:
public void service(HttpServletRequest sreq, HttpServletResponse sresp) {
    Page page = new Page("Content Section");

    page.add(new Label("Content Section"));

    TabbedPane tabs = new TabbedPane();
    page.add(tabs);

    tabs.addTab("Browse", new BrowsePane());
    tabs.addTab("Search", new SearchPane());
    tabs.addTab("Roles", new RoleAdminPane());

    page.lock();

    Document doc = page.buildDocument(sreq, sresp);

    transform(sreq, sresp, doc);
}

thanking you
sukesh

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