I believe my problem is caused by my approach and lack of understanding of
the technology rather than something in dom4j. Here's what I do. I have a
document like:
<RECORDSET>
<RECORD>data</RECORD
<RECORD>data</RECORD
<RECORD>data</RECORD
<RECORD>data</RECORD
</RECORDSET>
Because in real life the document is too big to hold in memory all at once I
need to apply XSLT in intermediate steps. I start reading in the document
and creating the dom4j document object. Once I have the root element I apply
a transformation and just write the open tag of the result with
XMLWriter.writeOpen(). I then remove the root from the document object and
read in a block of n records into the document. I then style the document
and serialize each record with just plain XMLWriter.write(). Finally after
all records have been processed I do a writeClose() with the root element to
close the document.
So the immediate problem I see is that when I am serializing the root node
there are no other nodes in memory and no way of knowing if a namespace
definition is actually needed. This is the first time I'm doing this so you
guys out there with more experience, does this problem make my approach
invalid? Can I get around it somehow or totally rethink my strategy? Is my
thinking just plain naive? ;-) The idea is to produce the same output that I
would get by applying a stylesheet to the whole dodument. When I do this,
the namespaces do appear in the output document.
I'll also take a look at writing some code to demonstrate this if I get a
chance, but I hope you get the picture.
Thanks,
Terry
-----Original Message-----
From: James Strachan [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, May 01, 2002 9:51 AM
To: Wilson, Terry; Dom4j-User (E-mail)
Subject: Re: [dom4j-user] Namespaces and writeOpen()
Internally XMLWriter uses a NamespaceStack to know if it needs to output new
namespace declarations with new nodes. It could be that the way that you're
using it, the XMLWriter isn't properly popping the namespace stack, so that
the required namespace definitions don't appear.
Any chance you could create a little unit test to demonstrate the problem?
I.e. a bit of code and a test document. Then it'd be easier to see the
problem.
If you could add an existing test method to an existing test case, such as
in dom4j/src/test/org/dom4j/TestXMLWriter, that'd be even better! :-)
James
----- Original Message -----
From: "Wilson, Terry" <[EMAIL PROTECTED]>
To: "Dom4j-User (E-mail)" <[EMAIL PROTECTED]>
Sent: Wednesday, May 01, 2002 5:36 PM
Subject: [dom4j-user] Namespaces and writeOpen()
> Hi all,
>
> I'm a new dom4j user and have a question I could not find an answer for
from
> the api or other documentation.
>
> I have a fairly classical situation where I have a "database" type XML
file
> (large, up to .5GB) that has a root node that has a set or child, record
> nodes. I need to apply XSLT transformations to this document, which I'm
> acchieving efficiently by utilizing the excellent ElementHandler
interface.
> I apply the stylesheets to a chunk of records at a time, serialize the
> results and move on to the next chunk. This seems to work fine, but I hit
a
> problem with the root node, which I also need to style.
>
> The root node has some namespace definitions that are causing me grief. If
I
> print out the transformed root node with asXML() the namespace definitions
> are still there, but when I use the writeOpen(rootElement) method in the
> XMLWriter class to serialize the output, it is missing the namespace
> definitions. Is there something special I need to do to have the
namespaces
> included when calling writeOpen()? The api doc says that attributes would
be
> included in the writeOpen() output, but what about namespace definitions?
> Are they left out on purpose and if so, how can I have them included in my
> output?
>
> I've tried this with two separate daily builds, the latest I downloaded
> yesterday (4/30/02).
>
> Hope I made some sense, any help appreciated.
>
>
> Thanks,
>
> Terry
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