[Zope] sorting a catalog - order

[Kevin Lewandowski]

This is probably really easy but I can't find it anywhere in the
docs. I can iterate over a catalog just fine, sorted, for
example:

<dtml-in Catalog sort_by=bobobase_modification_time>
 ...
</dtml-in>

But how do I sort in reverse order?

thanks much

-Kevin

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