Saxon XSLT and XQuery Processor

Hi Michael,

When using Saxon's identity transformer, with following
output keys:

format.put(OutputKeys.DOCTYPE_PUBLIC,"x");
format.put(OutputKeys.DOCTYPE_SYSTEM,"y");
format.put(OutputKeys.METHOD,"html");

Emitter outputs DOCTYPE twice, because
writeDocType called twice.

First time from:
HTMLEmitter.startDocument
Outputter.open
GeneralOutputter.setOutputDestination
IdentityTransformerHandler.startDocument, 97

and second time from:
HTMLEmitter.startDocument
ContentEmitter.startDocument
IdentityTransformerHandler.startDocument, 104


Not sure how this should be resolved, but I patched
XMLEmitter.java so it has check for second call:

------8<------
boolean docTypeWritten = false;
protected void writeDocType(...) {
if (docTypeWritten) return;
docTypeWritten = true;
------8<------


This bug present in Saxon 6.5.2 too.

Vadim