diff --git a/BridgeAbstract.md b/BridgeAbstract.md
index 0f00acd..314ff4c 100644
--- a/BridgeAbstract.md
+++ b/BridgeAbstract.md
@@ -40,11 +40,11 @@ $this->parameters = array();
 
 ### Parameters
 
-Parameters are defined in a JSON-like format, which is parsed and transformed into a HTML `<form>` by **RSS-Bridge**.
+Parameters are defined in an array, which is used to generate an HTML `<form>` by **RSS-Bridge**.
 
-These data go into the `$this->parameters` array, which is not mandatory if your bridge doesn't take any parameter.
+The `$this->parameters` array is not mandatory if your bridge doesn't take any parameter.
 
-Every possible usage of a bridge is an array element.
+The first level of this array describes every possible usage of a bridge.
 
 The array can be a key-based array, but it is not necessary. The following syntaxes are hereby correct :
 
@@ -62,17 +62,16 @@ $this->parameters['global'] = ...
 
 ### Format specifications
 
-Every `$this->parameters` element is a JSON array of cluster (`[ ... ]`) containing all input fields.
+`$this->parameters[]` element is an associative array whose key is the input field identifier, and the value is another array containing all input fields names and values.
 
 Following elements are supported :
 
 Parameter Name | Required | Type | Supported values | Description
 ---------------|----------|------|------------------| -----------
 `name` | **yes** | Text | | Input name as displayed to the user
-`identifier` | **yes** | Text | | Identifier, which will be the key in the `$param` array for the [`collectData`](#the-collectdata-function) function
 `type` | no | Text | `text`, `number`, `list`, `checkbox` |Type of the input, default is text
 `required` | no | Boolean | `true`, `false` | Set this if you want your attribute to be required
-`values` | no | Text | `[ {"name" : option1Name, "value" : "option1Value"}, ... ]` | Values list, required with the '`list`' type
+[`values`](#list-values) | no | associative array | | name/value pairs used by the HTML option tag, required with the '`list`' type
 `title` | no | Text | | Will be shown as tool-tip when mouse-hovering over the input
 `pattern` | no | Text | | Defines a pattern for an element of type `text`. The required pattern should be mentioned in the `title` attribute!
 `exampleValue` | no | Text | | Defines an example value that is shown for elements of type `text` and `number`
@@ -82,13 +81,10 @@ Hence, the most basic parameter definition is the following :
 
 ```PHP
 ...
-	$this->parameters[] =
-	'[
-		{
-			"name" : "Username",
-			"identifier" : "u"
-		}
-	]';
+	$this->parameters[] = array(
+		'u'=>array('name'=>'Username')
+	)
+
 ...
 ```
 
@@ -101,6 +97,39 @@ This attribute defines the default value for your parameter. Its behavior depend
 - `list`: Must match either name or value of one element
 - `checkbox`: Must be "checked" to activate the checkbox
 
+#### List values
+
+List values are defined in an associative array where keys are the string displayed in the combo list of the **RSS-Bridge** web interface, and values are the content of the \<option\> HTML tag value attribute.
+
+```PHP
+...
+    'type'=>'list',
+    'values'=>array(
+        'Item A'=>'itemA'
+        'Item B'=>'itemB'
+     )
+...
+```
+
+If a more complex organization is required to display the values, the above key/value can be used to set a title as a key and another array as a value:
+```PHP
+... 
+    'type'=>'list',
+    'values'=>array(
+        'Item A'=>'itemA',
+        'List 1'=>array(
+            'Item C'=>'itemC',
+            'Item D'=>'itemD'
+        ),
+        'List 2'=>array(
+            'Item E'=>'itemE',
+            'Item F'=>'itemF'
+        ),
+        'Item B'=>'itemB'
+    )
+...
+```
+
 ## The `collectData` function
 
 This function takes as a parameter an array called `$param`, that is automatically filled with values from the user, according to the values defined in the parameters array in `loadMetadatas`.
@@ -246,4 +275,4 @@ class MySiteBridge extends BridgeAbstract{
 	}
 }
 // Imaginary empty line!
-```
\ No newline at end of file
+`
\ No newline at end of file