Location of DTD file

[Gaurav Arya]

Hi,
I am using Xerces to parse an xml document which i get in response from an
external site. The XML has the following line:
<!DOCTYPE GSP SYSTEM "google.dtd">
I have kept the DTD file "google.dtd" in webapps\cnams\WEB-INF\classes
directory but I get an Exception saying "File "google.dtd" not found." Where
should I keep this dtd file?
Regards,
Gaurav