Problem validating schema based document with a declaration. (Followup)

["Peter C. Chapin" <pc...@ecet.vtc.edu>]

In an earlier message I said:

> Hello!
> 
> I have a document that starts out like this
> 
> ---- cut here ----
> <?xml version="1.0"?>
> 
> <!DOCTYPE observation-set [
>   <!ENTITY copy  "&#169;">
> ]>
> 
> <observation-set
>  xmlns="http://www.ecet.vtc.edu/~pchapin/AOML_0.0"
>  xmlns:xhtml="http://www.w3.org/1999/xhtml"
>  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>  xsi:schemaLocation="http://www.ecet.vtc.edu/~pchapin/AOML_0.0
>    AOML.xsd">
> 
>  <!-- etc -->
> </observation-set>
> 
> ---- cut here ----

This document does not validate. However, if the <!DOCTYPE> 
declaration is removed (along with the references to the 
&copy; entity) the document validates fine. I now understand 
why, but I don't know how to fix it.

I attempted to validate the document using the sax.Counter 
sample program provided with Xerces-J. I also wrote a simple 
program of my own to explore the issues. I turned on the 
following features:

	http://xml.org/sax/features/validation
	http://apache.org/xml/features/validation/schema

It is my understanding that I need both of these features to 
effect schema validation. However, the FAQ (in the Xerces-J 
documentation) says:

Q: What happens if I set both validation and schema validation 
features on?

A: ... if the instance document has both DTD and XML Schema 
grammars, validation errors for both DTD and XML Schema are 
reported...

In my case I need a DTD for the <!ENTITY> declaration. Thus 
Xerces will report both DTD and XML Schema validation errors. 
However since my DTD declares no elements, the DTD validation 
process reports an "undeclared element" for every element in 
my document. I noticed that if I inject a violation of the XML 
Schema into the document then I get an error about that 
violation in addition to all the "undeclared element" errors. 
Thus it appears that the DTD validation and XML Schema 
validation processes are occuring in parallel and largely 
independently.

The FAQ in the Xerces documentation goes on:

Q: How can I tell the parser to validate against XML Schema 
and not to report DTD validation errors?

A: Currently this is impossible. We hope that JAXP 1.2 will 
provide this capability via its schema language property. 

This would be a good time to state that I'm using Xerces-J 
v2.4.0 and the "readme" section of the documentation implies 
that JAXP 1.2 is supported. So the documentation seems 
somewhat inconsistent, but I guess that's not a shocking 
thing.

In any case, it appears that it is not possible to validate a 
document based on an XML Schema and that uses <!DOCTYPE> only 
for purposes of introducing entities. Is this really true? It 
seems somewhat incredible but the FAQ in the documentation is 
clear. The list of supported features does not seem to include 
anything that would allow me to specify that only XML Schema 
validation errors should be reported. Am I missing something?

Peter

P.S. I'm using j2sdk1.4.1


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