[Zope] ZCatalog query example without _usage

[Kevin Carlson]

Can someone point me to an example of querying a ZCatalog index without 
using the deprecated term "_usage" ?  In a current application, I am 
querying a catalog based on a date range and using something like 
{'date_usage' : "range:max"} in the dictionary I am passing to the 
query.  I have searched Zope.org for things and have read the README.txt 
file in the PluginIndexes product but have failed to find an example.

Any help is greatly appreciated.

Kevin