A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/SearchingZCatalog.stx#3-82
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Often you will use a small list of terms with KeywordIndexes.
In this case you may want to use the 'uniqueValuesFor' method to
create a custom search form. For example here's a snippet of a
Page Template that will create a multiple select box for all the
values in the 'keywords' index::
<select name="keywords:list" multiple>
<option
tal:repeat="item python:here.uniqueValuesFor('keywords')"
tal:content="item">
opt value goes here
</option>
</select>
% Anonymous User - Nov. 25, 2003 7:42 am:
please refer to Products/PluginIndexes/README.txt to change the operator! the default is OR, not AND.
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