ejb-jar.xml doctype reference for local DTD reference

[John Fairbairn]

Hi,
What is the syntax for specifying a local DTD in the doctype reference instead of the one on the java.sun.com site? I don't think I'm referencing it correctly... I have ejb-jar DTD on my computer at the following path: c:/usr/dtds/ejb-jar_2_0.dtd.
Currently using:
<!DOCTYPE ejb-jar PUBLIC
"-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"
"http://java.sun.com/dtd/ejb-jar_2_0.dtd">
Would like to use something like:
<!DOCTYPE ejb-jar SYSTEM
"file://c:/usr/dtds/ejb-jar_2_0.dtd">
Thank you in advance.
John