diff --git a/sat/tools/common/data_objects.py b/sat/tools/common/data_objects.py
index 9db5008c..ba4bcca1 100644
--- a/sat/tools/common/data_objects.py
+++ b/sat/tools/common/data_objects.py
@@ -72,8 +72,16 @@ def parsePubSubMetadata(metadata, items):
 
 
 class BlogItem(object):
-    def __init__(self, mb_data, parent):
-        self.mb_data = data_format.deserialise(mb_data)
+    def __init__(self, mb_data, parent, deserialise=True):
+        """
+        @param deserialise(bool): if True, mb_data is a serialised string which must
+          be deserialised
+        """
+        # FIXME: deserialise should not be done here, but before BlogItem is called
+        if deserialise:
+            self.mb_data = data_format.deserialise(mb_data)
+        else:
+            self.mb_data = mb_data
         self.parent = parent
         self._comments = None
         self._comments_items_list = None
@@ -180,8 +188,13 @@ class BlogItem(object):
 
 
 class BlogItems(object):
-    def __init__(self, mb_data):
-        self.items = [BlogItem(i, self) for i in mb_data[0]]
+    def __init__(self, mb_data, deserialise=True):
+        """
+        @param deserialise(bool): if True, mb_data is a serialised string which must
+          be deserialised
+        """
+        # FIXME: deserialise should not be done here, but before BlogItem is called
+        self.items = [BlogItem(i, self, deserialise=deserialise) for i in mb_data[0]]
         self.metadata = parsePubSubMetadata(mb_data[1], self.items)
 
     @property