--- a/Xml/Topics/centre_pompidou.xml	mar. juil. 19 18:16:50 2011 +0200
+++ b/Xml/Topics/centre_pompidou.xml	mer. juil. 20 14:38:48 2011 +0200
@@ -8,11 +8,14 @@
       <language xml:lang="fr-FR"/>
       <date value="2000-01-01"/>
       <place>Paris</place>
-      <source type="book" id="9782843550362">
+      <source type="book">
+        <identifier type="ean">9782843550362</identifier>
         <title>Chronique de l'année 2000</title>
         <pagenumber value="4"/>
       </source>
-      <source type="file" id="4a.tex"/>
+      <source type="file">
+        <identifier type="uri">4a.tex</identifier>
+      </source>
       <subjectset>
         <subject id="France"/>
         <subject id="Architecture"/>