diff -r a6c4ea119b80 -r eac14c3ae625 web/ldt/ldt_utils/models.py
--- a/web/ldt/ldt_utils/models.py	Fri Aug 06 17:19:37 2010 +0200
+++ b/web/ldt/ldt_utils/models.py	Thu Aug 19 12:15:27 2010 +0200
@@ -1,11 +1,11 @@
+from django.conf import settings
 from django.db import models
-from django.conf import settings
+from django.utils.translation import ugettext_lazy as _
 from ldt.core.models import Document, Owner
-from django.utils.translation import ugettext_lazy as _
 from utils import create_ldt, copy_ldt, create_empty_iri, update_iri
+import lxml.etree
 import os.path
 import uuid
-import xml
 
 class Author(models.Model):
 
@@ -33,11 +33,9 @@
 
     def get_duration(self):
         if self.duration is None:
-            doc = xml.dom.minidom.parse(self.iri_file_path())
-            doc = Ft.Xml.Domlette.ConvertDocument(doc)        
-            con = xml.xpath.Context.Context(doc, 1, 1, None)
-            res = xml.xpath.Evaluate("/iri/body/medias/media[@id='video']/video", context=con)
-            self.duration = int(res[0].getAttributeNS(None, u'dur'))
+            doc = lxml.etree.parse(self.iri_file_path())
+            res = doc.xpath("/iri/body/medias/media[@id='video']/video")
+            self.duration = int(res[0].get(u'dur') or 0)
             self.save()
         return self.duration
     
@@ -48,7 +46,7 @@
         writer.commit()
         
     #TODO: better manage the change in .iri name and error scenario (save in temp file + rename
-    def save(self):
+    def save(self, *args, **kwargs):
         # create iri file if needed
         created = False
         try:
@@ -70,7 +68,7 @@
                     os.remove(iri_file_path)
             raise e
         # update it 
-        super(Content, self).save()
+        super(Content, self).save(*args, **kwargs)
     
     def __unicode__(self):
         return str(self.id) + ": " + self.iri_id
@@ -112,13 +110,11 @@
     def get_description(self, doc=None):
         
         if doc is None:
-            doc = xml.dom.minidom.parseString(self.ldt)
-            doc = Ft.Xml.Domlette.ConvertDocument(doc)        
+            doc = lxml.etree.fromstring(self.ldt)
         
-        con = xml.xpath.Context.Context(doc, 1, 1, None)
-        res = xml.xpath.Evaluate("/iri/project", context=con)
+        res = doc.xpath("/iri/project")
         if len(res) > 0:
-            return res[0].getAttributeNS(None, u'abstract')
+            return res[0].get(u'abstract')
         else:
             return None