How to build my own LEXER

Hi :
I want to build a Text Query Application which bases on Oracle interMedia Text. Besides some default languages the interMedia supports (English, French ...), I need index on my own language document. When I refered to the Oracle Text Reference, I saw that I can use the BASIC_LEXER for English and all other supported whitespace delimited languages. My language is Vietnamese which has whitespace delimiter. The question is that can I build my own language dictionary-lexer (similar to some default dictionaries : English, France, German, Chinese ...) to index my document and how can I do that ? In the documents I refered (Oracle Text Application Developer's Guide and Oracle Text Reference) I could'n find direction for doing this.
Thanks.

Hi,
In 9.2 there is a new feature: USER_LEXER. The USER_LEXER lets you write and plug in your own lexer to handle
languages or other indexing techniques that Oracle Text does not support. We will be publishing the 9.2 Text technical
overview in a few days that shows you how to do it.

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