JAXP seems to be stripping off DOCTYPE tag

When I parse a document, the DOCTYPE tag is getting stripped off.
To parse, I read the document from file and it looks like :
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j">
After parsing, I dump it to the console and it looks like:
<?xml version="1.0" encoding="UTF-8"?>
<log4j:configuration debug="null" threshold="null" xmlns:log4j="http://jakarta.apache.org/log4j">
The mystery the output has two attributes set to defaults, the only the parser knows this is by reading the dtd. But why does not include the DOCTYPE tag?
The parsing code snippet is:
Document doc = null;
DocumentBuilderFactory dbFactory = null;
dbFactory = DocumentBuilderFactory.newInstance();
dbFactory.setNamespaceAware(true);
DocumentBuilder db = dbFactory.newDocumentBuilder();
db.setEntityResolver(new LogDTDResolver());
doc = db.parse(is); // is is an InputStreamAnyone have a clue? Is there a property I am missing. I have searched for the complete set of jaxp properties, but I can't find one.
Thanks for any help.

So it looks like log4j is doing its own parsing and it requires the DTD. Don't know how (or why) it does that.
You call the setOutputProperty() method of the Transformer. This is designed to configure the Transformer with properties that are normally set in the <xsl:output> element of an XSL transformation. The properties you need are "doctype-system" and maybe "doctype-public".
You're quite right, it isn't obvious. That's what happens when systems are designed by architects who believe in abstraction too much.

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