[Zope] Zope 2.7 - XML export

[Andreas Tille]

Hello,

I tried to use the XML export feature of an ordered Folder tree but got:

Traceback (innermost last):
  Module ZPublisher.Publish, line 100, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 40, in call_object
  Module OFS.ObjectManager, line 502, in manage_exportObject
  Module OFS.XMLExportImport, line 58, in exportXML
  Module OFS.XMLExportImport, line 33, in XMLrecord
  Module Shared.DC.xml.ppml, line 253, in load
  Module pickle, line 872, in load
  Module pickle, line 1209, in load_appends
AttributeError: List instance has no attribute 'extend'

Any hint what might went wrong here?

Kind regards

         Andreas.