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+While doing a select or any operations into XMLDB, you'll have 3 possible values in return:
+
+## Array
+
+A node can be figured as an array in this format:
+
+```
+Array => ('name' => 'item'),
+	('attributes' => array('id'=>'1',
+	                'name'=>'test')),
+	('childs' => array('visibility'=>'true',
+	                'x'=>'32'))
+```
+
+This array is equal to 
+
+```xml 
+<item id="1" name="test">
+	<visibility>true</visibility>
+	<x>32</x>
+</item>
+```
+
+## Node
+
+It's actually a "DOMNode": http://www.php.net/manual/fr/class.domnode.php
+
+It's mainly use for [Data manipulation](Data-Manipulation)
+
+We usually use Array for display or manual operation
+
+## Count
+
+Not really of format, but operation with this `$format` will return an Integer.
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