looking for example of using tdom/tnc to validate data against a dtd

Anyone using the tdom/tnc extensions in ActiveTcl to
validate
data against a dtd?

I have some data that is in WDDX format (see http://www.openwddx.org/

for details of WDDX - the web distributed data exchange
format).

I want to write a little script that would read in my data
and spit out
any messages about problems in the data format.

When I read the man page for tnc , it isn't clear how I
provide the
DTD to be used.

Any tips on how to do this?
-- 
Tcl - The glue of a new generation.  <URL: http://wiki.tcl.tk/ >
Larry W. Virden <mailto:lvirdencas.org><URL: http://www.purl.org/
NET/lvirden/ >
Even if explicitly stated to the contrary, nothing in this
posting should 
be construed as representing my employer's opinions.
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