[Zope] boolean search

[Pablo Ziliani]

Dear all,

Even though it seems so basic, I could't find a single reference to this
problem.
I'm trying to list some objects of a given meta_type based on some booleans
they *might* have.

For example:
<dtml-in "Catalog.searchResults({'meta_type':'whatever','published':'1'})">

While a missing boolean property (żalways?) means "off", there's often
arbitrary values when in "on" state, mainly depending on how the input was
set in the form.

So the question is: how should the query be set to bring only those items
that DO have a certain property?

TIA,
Pablo