A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/SearchingZCatalog.stx#3-10
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Now we can create an index that will record the information we
want to have in the ZCatalog. Click on the *Indexes* tab of the
ZCatalog. A drop down menu lists the available indexes. Choose
*ZCTextIndex*; in the add form fill in the id *zooTextIdx*.
Fill in *PrincipiaSearchSource* in the "Field name" input. This
tells the ZCTextIndex to index the body text of the DTML
Documents (*PrincipiaSearchSource* is an API method of all DTML
Document and Method objects). Note that *zooLexicon* is
preselected in the *Lexicon* menu.
"ZCTextIndex add form":img:16-3:Figures/creatingtextindex.png
% Anonymous User - Feb. 10, 2004 12:43 pm:
When you want the textindex to work on other types of objects, they have to provide a method named
"PrincipiaSearchSource" which returns the data of the object which has to be searched.
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