-        for attachment in self.attachment_set.all():
-            zipf.write(attachment.file.path,
-                u"%smaterialy/%s.%s" % (prefix, attachment.slug, attachment.ext))
-            
-        
+            for attachment in self.attachment_set.all():
+                zipf.write(attachment.file.path,
+                    u"%smaterialy/%s.%s" % (prefix, attachment.slug, attachment.ext))
+            zipf.write(self.xml_file.path,
+                "%spliki-zrodlowe/%s.xml" % (prefix, self.slug))