[Zope] ZCatalog with OR expression

[Garikoitz Araolaza]

Hi!

I'm trying to get an OR expression from a catalog:

For example:

<dtml-in "Catalog(meta_type='Image', title='Z*')">

So, this way I'm having objects with meta_type='Image' AND title starting 
with Z.

Now, I need an OR expression:

I need cataloged objects with meta_type='Image' OR with title='Z*'

This can be done adding "two Catalogs:

<dtml-in "Catalog(meta_type='Image')+Catalog(title='Z*')">

But... this way I get some objects two times: the ones filling both 
expressions.

How could this be done better?

Thanks if somebody can help...

Gari

PS: The real case is more complicated, I'm searching dates between 
ranges... but I think that the problem is the basic solution... Thank you.

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