public ProcessingNode buildNode(Configuration config) throws Exception 
{
        // Get the label or position (pseudo-label) of this view.
        String label = config.getAttribute("from-label", null);
        if (label == null) {
            String position = config.getAttribute("from-position");
            if ("first".equals(position)) {
                label = SitemapLanguage.FIRST_POS_LABEL;
            } else if ("last".equals(position)) {
                label = SitemapLanguage.LAST_POS_LABEL;
            } else {
                String msg = "Bad value for 'from-position' at " + config.getLocation();
                throw new ConfigurationException(msg);
            }
        }
        SitemapLanguage sitemapBuilder = (SitemapLanguage)this.treeBuilder;
        // Indicate to child builders that we're in a view (they won't perform view branching)
        sitemapBuilder.setBuildingView(true);
        // Build children
        NamedProcessingNode result = (NamedProcessingNode)super.buildNode(config);
        sitemapBuilder.addViewForLabel(label, result.getName());
        // Clear the flag
        sitemapBuilder.setBuildingView(false);
        return result;
}