--- a/DependencyInjection/Configuration.php	Tue Oct 25 12:20:47 2011 +0200
+++ b/DependencyInjection/Configuration.php	Thu Oct 27 05:51:04 2011 +0200
@@ -19,11 +19,33 @@
     {
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('wiki_tag');
-
-        // Here you should define the parameters that are allowed to
-        // configure your bundle. See the documentation linked above for
-        // more information on that topic.
-
+        
+        $rootNode
+            ->children()
+                ->scalarNode('document_class')->end()
+                ->scalarNode('document_id_column')->defaultValue('id')->end()
+            ->end()
+            ->fixXmlConfig('field')
+            ->children()
+                ->arrayNode('fields')
+                    ->treatNullLike(array())
+                    ->useAttributeAsKey('name')
+                    ->prototype('array')
+                        ->performNoDeepMerging()
+                        ->children()
+                            ->scalarNode('type')->defaultValue('text')->end()
+                            ->scalarNode('length')
+                                ->beforeNormalization()
+                                    ->ifString()
+                                    ->then(function($v) { return intval($v); })
+                                ->end()
+                            ->end()
+                            ->scalarNode('accessor')->end()
+                        ->end()
+                    ->end()
+                ->end()
+            ->end();
+        
         return $treeBuilder;
     }
 }