/**
* Append a node definition.
*
* $node = new ArrayNodeDefinition()
* ->children()
* ->scalarNode('foo')
* ->scalarNode('baz')
* ->end()
* ->append($this->getBarNodeDefinition())
* ;
*
* @return ArrayNodeDefinition This node
*/
public function append(NodeDefinition $node)
{
$this->children[$node->name] = $node->setParent($this);
return $this;
}