A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/SearchingZCatalog.stx#3-80
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You can use a *Keyword* index to search the 'keywords' property. Define
a *Keyword* index with the name 'keywords' on your ZCatalog. Then
catalog your Images. Now you should be able to find all the Images
that are portraits by creating a search form and searching for
"Portraits" in the 'keywords' field. You can also find all pictures
that represent 19th Century subjects by searching for "19th
Century".
% Anonymous User - Dec. 7, 2003 6:11 am:
ops, it was "you cannot retrieve".
there's a bug in pluginindexes, in common/util.py. When you have a record with an empty value, the variable
key is not None as when you've an empty string. I was unable to delete the entry in the REQUEST, so I've
patched util.py to send back None if keys is empty, when it is a record.
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