[Zope] BTree listing by type

[Andre Meyer]

Dear Zopistas

Here a question wrt. BTrees:

When I create a IOBTree object (for example) and add objects of different kinds (classes) to it, how can I retrieve a list of all objects of a certain type? What I want is something similar to objectValues(type) in Folder. Does that exist for BTrees or do I need to use ZCatalog? How would that work?

thanks a lot
Andre
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