Is possible to alter default collations for Oracle Text?

Oracle supports custom linguistic sorts for sorting and matching.
Is something similar availble for Oracle text?
Specifiaccaly we want to alter base letter definitions and ignorable characters for a given language.

Barbara, thank you for your reply.
The purpose was to satisfy certain requirements of arabic text search. These seem to be fulfilled by WORLD LEXER, so the case is closed.
Note that BASIC and AUTO LEXER implement differently the lexing of arabic text, with result not to be candidates for such a solution.
By the way, I tried to use skipjoins for setting an ignorable character but it did not work (auto lexer).

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