old_contents: from couchforms.models import XFormInstance
  
  def run():
      instances = XFormInstance.view('couchforms/xform').all()
      for instance in instances:
          instance["#export_tag"] = ["domain", "xmlns"]
          instance.save()
new_contents: from couchforms.models import XFormInstance
  
  def run():
      instances = XFormInstance.view('couchforms/by_xmlns', include_docs=True).all()
      for instance in instances:
          instance["#export_tag"] = ["domain", "xmlns"]
          instance.save()
subject: change view used by helper script, because it was removed from couchforms