transforming, how to disable validation

[Wu, Ying (LNG-CIS)]

I need to transform a xml file, which contains a doctype node:
<!DOCTYPE PUB-ENTRY SYSTEM "\\a.dtd"> 
The transforming process will first validate the input file.

Is there any xalan API to tell the Process do not validate, just transform?
Both command line and java code are OK, I just don't want to get into the
parser level.

Thanks,

Ying Wu
301-941-2953