[Zope] XMLDocument create attributes problem

[matt]

Hi,
I'm trying to make an external method create and set some attributes of nodes
in an XML document.  The following is a fragment of the code, and the error.  I
can't even get a valid attribute created, let alone set.  Does anyone have some
examples?

Please could you reply to me as well as the list,

regards
Matt


from Products.XMLDocument.XMLDocument import Document
 
def add(self, id, title):
    ob=Document()
    ob.title=title
    ob.id=id
    id=self._setObject(id, ob)
 
    log_node = ob.createElement('log')
 
    an_at = ob.createAttribute('attribute1')  



                Zope Error

                Zope has encountered an error while publishing this resource. 

                Error Type: TypeError
                Error Value: too many arguments; expected 3, got 4

Traceback (innermost last):
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 222, in publish_module
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 187, in publish
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook
    (Object: Traversable)
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 171, in publish
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/ZPublisher/mapply.py, line 160, in mapply
    (Object: CreateNewsItem)
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 112, in call_object
    (Object: CreateNewsItem)
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/OFS/DTMLMethod.py, line 172, in __call__
    (Object: CreateNewsItem)
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/DocumentTemplate/DT_String.py, line 528, in __call__
    (Object: CreateNewsItem)
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/DocumentTemplate/DT_Util.py, line 337, in eval
    (Object: addxmldoc('test', 'some_title_test'))
    (Info: addxmldoc)
  File <string>, line 0, in ?
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/Products/ExternalMethod/ExternalMethod.py, line 270, in __call__
    (Object: addxmldoc)
    (Info: (('test', 'some_title_test'), {}, None))
  File /usr/local/zope/Zope-2.2.0-linux2-x86/Extensions/addxmldoc.py, line 11, in add
    (Object: Traversable)
  File /usr/local/zope/Zope-2.2.0-linux2-x86/lib/python/Products/XMLDocument/XMLDocument.py, line 283, in createAttribute
    (Object: Manageable)
TypeError: (see above)