public ProcessingNode buildNode(Configuration config) throws Exception 
{
          
        String pattern = config.getAttribute("pattern", null);
        String name = config.getAttribute("name", null);
        String type = this.treeBuilder.getTypeForStatement(config, SELECTOR_ROLE);
        // Get the type and class for this matcher
        ComponentsSelector selector = (ComponentsSelector)this.manager.lookup(SELECTOR_ROLE);
        Class clazz = null;
        try {
            // Find matcher class
            Matcher matcher = (Matcher)selector.select(type);
            clazz = matcher.getClass();
            selector.release(matcher);
        } finally {
            this.manager.release(selector);
        }
        // PreparableMatcher are only prepared if pattern doesn't need request-time resolution.
        boolean preparable =
            PreparableMatcher.class.isAssignableFrom(clazz) &&
            !VariableResolverFactory.needsResolve(pattern);
        // Instanciate appropriate node
        SimpleSelectorProcessingNode node;
        VariableResolver patternResolver = VariableResolverFactory.getResolver(pattern, this.manager);
        if (preparable) {
            node = new PreparableMatchNode(type, VariableResolverFactory.unescape(pattern),name);
        } else {
            node = new MatchNode(type, patternResolver,name);
        }
        this.treeBuilder.setupNode(node, config);
        // Get all children
        ProcessingNode[] children = buildChildNodes(config);
        node.setChildren(children);
        return node;
}