public ProcessingNode buildNode(Configuration config) throws Exception 
{
        
        boolean inActionSet = this.treeBuilder.getAttribute(ActionSetNodeBuilder.IN_ACTION_SET) != null;
        // Is it an action-set call ?
        this.actSetName = config.getAttribute("set", null);
        if (actSetName == null) {
            if (inActionSet) {
                // Check that children are only parameters or actions
                Configuration children[] = config.getChildren();
                for (int i = 0; i <  children.length; i++) {
                    String name = children[i].getName();
                    if (!"act".equals(name) && !"parameter".equals(name)) {
                        throw new ConfigurationException("An action set can only contain actions and not '" 
                            + name + "' at " + children[i].getLocation());
                    }
                }
            }
            String name = config.getAttribute("name", null);
            String source = config.getAttribute("src", null);
            String type = this.treeBuilder.getTypeForStatement(config, Action.ROLE + "Selector");
            ActTypeNode actTypeNode = new ActTypeNode(
                type,
                VariableResolverFactory.getResolver(source, this.manager),
                name,
                inActionSet
            );
            this.treeBuilder.setupNode(actTypeNode, config);
            actTypeNode.setChildren(buildChildNodes(config));
            return actTypeNode;
        } else {
            if (inActionSet) {
                throw new ConfigurationException("Cannot call an action set from an action set at " + config.getLocation());
            }
            // Action set call
            if (config.getAttribute("src", null) != null) {
                getLogger().warn("The 'src' attribute is ignored for action-set call at " + config.getLocation());
            }
            this.actSetNode = new ActSetNode();
            this.treeBuilder.setupNode(this.actSetNode, config);
            this.actSetNode.setChildren(buildChildNodes(config));
            return this.actSetNode;
        }
}

 public  void linkNode() throws Exception 
{
        if (this.actSetNode != null) {
            // Link action-set call to the action set
            CategoryNode actionSets = CategoryNodeBuilder.getCategoryNode(this.treeBuilder, "action-sets");
            if (actionSets == null)
                throw new ConfigurationException("This sitemap contains no action sets. Cannot call at " + actSetNode.getLocation());
            ActionSetNode actionSetNode = (ActionSetNode)actionSets.getNodeByName(this.actSetName);
            this.actSetNode.setActionSet(actionSetNode);
        }
}