diff --git a/Formatter/AbstractFormatter.php b/Formatter/AbstractFormatter.php
index 1ef7c3e..eadc844 100644
--- a/Formatter/AbstractFormatter.php
+++ b/Formatter/AbstractFormatter.php
@@ -20,7 +20,9 @@ abstract class AbstractFormatter implements FormatterInterface
      */
     public function formatOne(ApiDoc $annotation)
     {
-        return $this->renderOne($annotation->toArray());
+        return $this->renderOne(
+            $this->processAnnotation($annotation->toArray())
+        );
     }
 
     /**
@@ -28,12 +30,9 @@ abstract class AbstractFormatter implements FormatterInterface
      */
     public function format(array $collection)
     {
-        $array = array();
-        foreach ($collection as $coll) {
-            $array[$coll['resource']][] = $coll['annotation']->toArray();
-        }
-
-        return $this->render($array);
+        return $this->render(
+            $this->processCollection($collection)
+        );
     }
 
     /**
@@ -66,15 +65,14 @@ abstract class AbstractFormatter implements FormatterInterface
     protected function compressNestedParameters(array $data, $parentName = null, $ignoreNestedReadOnly = false)
     {
         $newParams = array();
-
         foreach ($data as $name => $info) {
             $newName = $this->getNewName($name, $info, $parentName);
 
             $newParams[$newName] = array(
-                'description' => $info['description'],
-                'dataType' => $info['dataType'],
-                'readonly' => $info['readonly'],
-                'required' => $info['required']
+                'description'   => $info['description'],
+                'dataType'      => $info['dataType'],
+                'readonly'      => $info['readonly'],
+                'required'      => $info['required'],
             );
 
             if (isset($info['children']) && (!$info['readonly'] || !$ignoreNestedReadOnly)) {
@@ -99,10 +97,46 @@ abstract class AbstractFormatter implements FormatterInterface
     protected function getNewName($name, $data, $parentName = null)
     {
         $newName = ($parentName) ? sprintf("%s[%s]", $parentName, $name) : $name;
-
-        $array = (false === strpos($data['dataType'], "array of")) ? "" : "[]";
+        $array   = (false === strpos($data['dataType'], "array of")) ? "" : "[]";
 
         return sprintf("%s%s", $newName, $array);
     }
 
+    /**
+     * @param  array $annotation
+     * @return array
+     */
+    protected function processAnnotation($annotation)
+    {
+        if (isset($annotation['parameters'])) {
+            $annotation['parameters'] = $this->compressNestedParameters($annotation['parameters'], null, true);
+        }
+
+        if (isset($annotation['response'])) {
+            $annotation['response'] = $this->compressNestedParameters($annotation['response']);
+        }
+
+        return $annotation;
+    }
+
+    /**
+     * @param  array[ApiDoc] $collection
+     * @return array
+     */
+    protected function processCollection(array $collection)
+    {
+        $array = array();
+        foreach ($collection as $coll) {
+            $array[$coll['resource']][] = $coll['annotation']->toArray();
+        }
+
+        $processedCollection = array();
+        foreach ($array as $path => $annotations) {
+            foreach ($annotations as $annotation) {
+                $processedCollection[$path][] = $this->processAnnotation($annotation);
+            }
+        }
+
+        return $processedCollection;
+    }
 }
diff --git a/Formatter/FormatterInterface.php b/Formatter/FormatterInterface.php
index 1a3302f..95147c2 100644
--- a/Formatter/FormatterInterface.php
+++ b/Formatter/FormatterInterface.php
@@ -18,7 +18,7 @@ interface FormatterInterface
     /**
      * Format a collection of documentation data.
      *
-     * @param  array        $collection
+     * @param  array[ApiDoc] $collection
      * @return string|array
      */
     public function format(array $collection);
diff --git a/Formatter/HtmlFormatter.php b/Formatter/HtmlFormatter.php
index 2981ca1..54677c0 100644
--- a/Formatter/HtmlFormatter.php
+++ b/Formatter/HtmlFormatter.php
@@ -36,7 +36,7 @@ class HtmlFormatter extends AbstractFormatter
     private $enableSandbox;
 
     /**
-     * @var \Symfony\Component\Templating\EngineInterface
+     * @var EngineInterface
      */
     private $engine;
 
@@ -98,6 +98,9 @@ class HtmlFormatter extends AbstractFormatter
         $this->requestFormatMethod = $method;
     }
 
+    /**
+     * @param string $format
+     */
     public function setDefaultRequestFormat($format)
     {
         $this->defaultRequestFormat = $format;
@@ -108,16 +111,11 @@ class HtmlFormatter extends AbstractFormatter
      */
     protected function renderOne(array $data)
     {
-        if (isset($data['parameters'])) {
-            $data['parameters'] = $this->compressNestedParameters($data['parameters'], null, true);
-        }
-
-        if (isset($data['response'])) {
-            $data['response'] = $this->compressNestedParameters($data['response']);
-        }
-
         return $this->engine->render('NelmioApiDocBundle::resource.html.twig', array_merge(
-            array('data' => $data, 'displayContent' => true),
+            array(
+                'data'           => $data,
+                'displayContent' => true,
+            ),
             $this->getGlobalVars()
         ));
     }
@@ -127,25 +125,10 @@ class HtmlFormatter extends AbstractFormatter
      */
     protected function render(array $collection)
     {
-        $processedCollection = array();
-
-        foreach ($collection as $path => $methods) {
-            $processedCollection[$path] = array();
-            foreach ($methods as $method) {
-                if (isset($method['parameters'])) {
-                    $method['parameters'] = $this->compressNestedParameters($method['parameters'], null, true);
-                }
-
-                if (isset($method['response'])) {
-                    $method['response'] = $this->compressNestedParameters($method['response']);
-                }
-
-                $processedCollection[$path][] = $method;
-            }
-        }
-
         return $this->engine->render('NelmioApiDocBundle::resources.html.twig', array_merge(
-            array('resources' => $processedCollection),
+            array(
+                'resources' => $collection,
+            ),
             $this->getGlobalVars()
         ));
     }
@@ -167,5 +150,4 @@ class HtmlFormatter extends AbstractFormatter
             'js'                   => file_get_contents(__DIR__ . '/../Resources/public/js/all.js'),
         );
     }
-
 }
diff --git a/Formatter/MarkdownFormatter.php b/Formatter/MarkdownFormatter.php
index b794ba4..3f3ac32 100644
--- a/Formatter/MarkdownFormatter.php
+++ b/Formatter/MarkdownFormatter.php
@@ -18,14 +18,6 @@ class MarkdownFormatter extends AbstractFormatter
      */
     protected function renderOne(array $data)
     {
-        if (isset($data['parameters'])) {
-            $data['parameters'] = $this->compressNestedParameters($data['parameters'], null, true);
-        }
-
-        if (isset($data['response'])) {
-            $data['response'] = $this->compressNestedParameters($data['response']);
-        }
-
         $markdown = sprintf("### `%s` %s ###\n", $data['method'], $data['uri']);
 
         if (isset($data['description'])) {
diff --git a/Formatter/SimpleFormatter.php b/Formatter/SimpleFormatter.php
index 788f913..e6aab92 100644
--- a/Formatter/SimpleFormatter.php
+++ b/Formatter/SimpleFormatter.php
@@ -11,14 +11,36 @@
 
 namespace Nelmio\ApiDocBundle\Formatter;
 
+use Nelmio\ApiDocBundle\Annotation\ApiDoc;
+
 class SimpleFormatter extends AbstractFormatter
 {
+    /**
+     * {@inheritdoc}
+     */
+    public function formatOne(ApiDoc $annotation)
+    {
+        return $annotation->toArray();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function format(array $collection)
+    {
+        $array = array();
+        foreach ($collection as $coll) {
+            $array[$coll['resource']][] = $coll['annotation']->toArray();
+        }
+
+        return $array;
+    }
+
     /**
      * {@inheritdoc}
      */
     protected function renderOne(array $data)
     {
-        return $data;
     }
 
     /**
@@ -26,6 +48,5 @@ class SimpleFormatter extends AbstractFormatter
      */
     protected function render(array $collection)
     {
-        return $collection;
     }
 }