Base-Letter Conversion for Characters with Diacritical Marks

Some languages contain characters with diacritical marks, such as tildes, umlauts, and accents. When your indexing operation converts words containing diacritical marks to their base-letter form, queries do not have to contain diacritical marks to score matches.

For example, in a Spanish base-letter index, a query of energía matches energía and energia. However, if you disable base-letter indexing, a query of energía only matches energía.

Enable and disable base-letter indexing for your language with the base_letter attribute of the BASIC_LEXER preference type.

See Also: Oracle Text Reference to learn more about the BASIC_LEXER