Extract information from archived log files

I need to extract information from some archived log files but I can't use 
LogMiner.

I wrote a small Java program and am trying to guess the record struct reading 
one archived file, but I can´t figure it out.

Does any one knows where can I find archived log files struct definition ?

I've searched ixora.au and other sites containing Oracle internals information, 
but I found nothing.

Regards,
Antonio Belloni

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