Is this possible?

["Tesar, Mark" <Ma...@Kingland.com>]

I'm a newbie, so please forgive me if this is too basic, but is it possible
to include an External Entity file in an XML document that is being parsed
by Xerces-J, either 1.4.4 or 2.0.1.  I have tried this using both versions
in my Tomcat instance and I'm getting a Null Pointer Exception from Xerces.

As an example, can I do this:

web.xml:

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app 
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 
    "web-app_2_3.dtd"
[
<!ENTITY % productBase SYSTEM "WEBX.PRODUCT.ENT">
%productBase;
]>

<web-app id="WebApp">

  blah, blah, blah
  Use Entity variables &SAMPLE1; and &SAMPLE2;
  blan, blah, blah

</web-app>

Where WEBX.PRODUCT.ENT looks like this:

<!-- Product information -->
 
<!ENTITY SAMPLE1	"Stuff1">
<!ENTITY SAMPLE2  "Stuff2">


Is this supported?  If not, why not and will it ever be?  If it is
supported, any idea what I could be doing wrong?

Thanks,
Mark Tesar

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