Thanks for the help.

Summary:
CalendarTag works fine in 2.1.6 but is broken in 2.20b3.
__call__ is mapped to render(self,md) - this is the same for all dtml
tags AFAIK.

The point that I find hard to understand is that namespace in DT_Util
has changed from 2.1.6 as follows

===========2.1.6==================
class namespace_: 
    pass

def namespace(self, **kw):
    """Create a tuple consisting of a single instance whos attributes
are
    provided as keyword arguments."""
    r=namespace_()
    d=r.__dict__
    for k, v in kw.items(): d[k]=v
    return r,

========2.2.0b3============
class namespace_:
    __allow_access_to_unprotected_subobjects__=1

def namespace(self, **kw):
    """Create a tuple consisting of a single instance whos attributes
are
    provided as keyword arguments."""
    return apply(self, (), kw)

Now, I can easily put the old definition back and it might work - but
I'm not in a position to understand why the method has changed from what
looks like a simple dictionary construction to the apply function -
which doesn't seem to have anything to do with the namespace_ class !!

Brian??

Dieter Maurer wrote:
> The "self", more precisely, its "__call__" gets the keyword
> "linkDate" which it does not (no longer) likes to have.


> 
> Dr. Ross Lazarus writes:
>  > Trying the new 2.2.0b3 zope.
>  > One zclass using ty's calendar tag now breaks with an error message I
>  > just cannot figure out -
>  >
>  > Error Type: TypeError
>  > Error Value: unexpected keyword argument: linkDate
>  >
>  >   File /usr/local/zope/zope22b3/lib/python/DocumentTemplate/DT_Util.py,
>  > line 262, in namespace
>  > TypeError: (see above)
>  >
>  > I added  __allow_access_to_unprotected_subobjects__=1 to the CalendarTag
>  > class just in case.
>  >
>  > The offending line in CalendarTag.py is
>  >
>  >         ns = namespace(self,
>  >             date = date,
>  >             mode = self.mode,
>  >             firstday = firstday,
>  >             setCalendar = self.setCalendar_,
>  >             getCalendar = self.getCalendar_,
>  >             linkDate = self.linkDate_
>  >         )[0]
>  >
>  >
>  > namespace in DT_Util seems harmless enough -
>  >
>  > def namespace(self, **kw):
>  >      """Create a tuple consisting of a single instance whos attributes are
>  >         provided as keyword arguments."""
>  >      return apply(self, (), kw)
> The "self", more precisely, its "__call__" gets the keyword
> "linkDate" which it does not (no longer) likes to have.
> 
> Dieter

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