'Default method used to render the final css links for the
rendered webpage.
Override this method in a sub-classed controller to change the output.'

def render_linked_css(self, css_files):

    paths = []
    unique_paths = set()
    for path in css_files:
        if (not is_absolute(path)):
            path = self.static_url(path)
        if (path not in unique_paths):
            paths.append(path)
            unique_paths.add(path)
    return ''.join(((('<link    href="' + escape.xhtml_escape(p)) + '"    type="text/css"    rel="stylesheet"/>') for p in paths))
