[Zope3-Users] slightly modifying a dublin core property?

[Maken Seteva]

Hi!
I'm trying to use the dublincore subjects property with a slight  
modification. Originally it uses TextLine
but i want it to use my home made "Word" schema field type (behaves  
like TextLine but with no spaces)

class IWordSubjects(IDCExtended):
      subjects = Tuple(
          title = _(u'Words'),
          description = _(u"A list of words describing the object"),
          value_type = Word(title=u'Word'),
          max_length=10,
          )

Is this possible of doing? Just inheriting from IDCExtended and  
overriding subjects...
This was added to my addform:

form_fields = Fields(IItem).omit('__parent__', '__name__') +\
                         Fields(IWordSubjects).select('subjects')


The adding view looks as expected and it complains when word is not a  
word, and i cannot add more
than 10 subjectwords, that's all good. But as soon as all fields are  
valid and it tries to create the object it fails:


   File "/home/mset/Zope-3.3.1/testinstance/lib/python/foo/browser/ 
item.py", line 39, in create
     applyChanges(job, self.form_fields, data)
   File "/home/mset/Zope-3.3.1/lib/python/zope/formlib/form.py", line  
521, in applyChanges
     adapter = interface(context)
TypeError: ('Could not adapt', <foo.item.Item object at 0x3d32130>,  
<InterfaceClass foo.interfaces.IWordSubjects>)

Seems to be some more things i need to do in addform maybe?
Here's my create function in the addform:

      def create(self, data):
          item = createObject('foo.Item')
          applyChanges(item, self.form_fields, data)
          return item


Any ideas? I'm not sure my way of doing this is even possible, maybe  
there's some other very simple way?

thanks in advance
Seteva