diff -r ad7d84868c98 -r eb6530b77b0e src/p4l/models/data.py
--- a/src/p4l/models/data.py	Thu Sep 12 17:26:15 2013 +0200
+++ b/src/p4l/models/data.py	Thu Sep 12 18:17:53 2013 +0200
@@ -171,6 +171,9 @@
     
     isDocumentPart = models.BooleanField() #iiep:isDocumentPart
     isMultilingual = models.BooleanField() #iiep:isMultilingual
+    
+    def get_imprints_years(self):
+        return set(sorted([i.imprintDate for i in self.imprints.all()]))
 
     def __unicode__(self):
         return "Record id %s { identifier: %s, uri: %s, editionStatement: %s,  recordType: %s, isDocumentPart: %s, notes: %s, language : %s}" \