diff -r 81cc9274c20a -r c288952a089f Controller/WikiTagController.php
--- a/Controller/WikiTagController.php	Mon Oct 24 19:08:04 2011 +0200
+++ b/Controller/WikiTagController.php	Tue Oct 25 12:20:47 2011 +0200
@@ -266,6 +266,7 @@
         // We search if the unsemantized version of the tag already exist.
         $un_tag = $this->getDoctrine()->getRepository('WikiTagBundle:Tag')->findOneBy(array('label'=>$tag->getLabel(), 'urlStatus'=>Tag::$TAG_URL_STATUS_DICT['null_result']));
         $em = $this->getDoctrine()->getEntityManager();
+        $un_tag_created = FALSE;
         if(!$un_tag){
             // Create another tag almost identical, without the W info
             // TODO: use a factory that return a TagInterface
@@ -280,14 +281,32 @@
             $un_tag->setAlias($tag->getAlias());
             $un_tag->setPopularity($tag->getPopularity());
             $em->persist($un_tag);
+            $un_tag_created = TRUE;
         }
-        // We associate the unsemantized tag to the DocumentTag and save datas
-        // TODO: do the request on external id of document
-        $dt = $this->getDoctrine()->getRepository('WikiTagBundle:DocumentTag')->findOneBy(array('document' => $id_doc, 'tag' => $id_tag));
-        $dt->setTag($un_tag);
-        $em->flush();
         
-        return $this->renderDocTags($id_doc);
+        if($id_doc && $id_doc!=""){
+            // We associate the unsemantized tag to the DocumentTag and save datas
+            // TODO: do the request on external id of document
+            $dt = $this->getDoctrine()->getRepository('WikiTagBundle:DocumentTag')->findOneBy(array('document' => $id_doc, 'tag' => $id_tag));
+            $dt->setTag($un_tag);
+            $em->flush();
+            return $this->renderDocTags($id_doc);
+        }
+        else{
+            // Here we are in the context of tag list.
+            if($un_tag_created==TRUE){
+                $em->flush();
+                $num_page = $this->getRequest()->request->get('num_page');
+                $nb_by_page = $this->getRequest()->request->get('nb_by_page');
+                $sort = $this->getRequest()->request->get('sort');
+                $searched = $this->getRequest()->request->get('searched');
+                return $this->renderAllTags($num_page, $nb_by_page, $sort, $searched);
+            }
+            else{
+                // The unsemantized version of the tag already exist, so we send an error.
+                return new Response(json_encode(array('error' => 'duplicate_tag', 'message' => sprintf("La version désémantisée du tag %s (%s) existe déjà.", $un_tag->getLabel(), $un_tag->getOriginalLabel()))),400);
+            }
+        }
     }