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dtSearch Text Retrieval Engine Programmer's Reference
DOptions::AlphabetFile Data Member
DStringProperty AlphabetFile;

Name of dtSearch alphabet file to use when parsing text into words. The alphabet file determines which characters are letters and what the rules are for handling capitalization and punctuation. If blank, dtSearch will use a default alphabet file. 

The alphabet file only controls the indexing of characters in the range 32-127. Unicode character properties control the treatment of other characters.

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