[Zope3-Users] Q: Custom containers, non-persistent items

[Paul Everitt]

First, this is very much a newbie question, so apologies in advance.  
Yesterday I sent this note to zope3-dev before this list was created, 
but this question clearly isn't meant for zope3-dev.

I'm trying to fill in the example in 
zope/app/container/sample.py->SampleContainer.  My ultimate goal is to 
traverse a custom container, grab the next item, and look it up in 
Berkeley DB XML.  For example, dbxmlfolder/37 would look up an item 
"37" in the DBXML and return some HTML that I generate.

sample.py->SampleContainer has a method _newContainerData where you 
supply a mapping.  I have wired this up, returning an empty dictionary, 
and I can browse to dbxmlfolder.  I can't, though, browse to any items 
in the dictionary.

(Yesterday I had a complex traceback, but this was due to something 
dumb in the ZCML I wired in.)

I've tried a few things, but I'm clearly flailing.  Thus some questions:

1) Are the keys for this dictionary simple strings?

2) Are the values...errr, special in any way?  For example, can I just 
put instances of Python classes that aren't wired into the CA (so I can 
skip debugging ZCML, interfaces, factories, views, etc. until I get 
past this traceback)?

Stated differently, what is the least amount of work to get 
_newContainerData to return non-empty sample information when 
traversing to an item?  I'm looking for something like Bobo's  
publishable mappings.

Thanks for any insight!

--Paul