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Subject: XOM API for Processing XML with Java

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  • From: Michael Kay <mike AT saxonica.com>
  • To: xom-interest AT lists.ibiblio.org
  • Subject: Re: [XOM-interest] Processing XML file of 4GB
  • Date: Mon, 30 Apr 2012 14:03:32 +0100

Follow-up questions then:

(1) how big is an xbrli:context object?

(2) is the validation of each xbrli:context object independent of the others?

(3) what is the logic of the validation that needs to be performed?

Michael Kay
Saxonica

On 30/04/2012 13:37, Geet Gangwar wrote:
Hi Michael,

Basically I need to perform some validation on the xml files. So my
requirement is to pick particular block from xml and validate that block.
For example say I want to pull all context i.e

XPATH expression like : /xbrli:xbrl/xbrli:context

from the document and validate them.

Regards

Geet

On Mon, Apr 30, 2012 at 5:41 PM, Michael Kay<mike AT saxonica.com> wrote:

NUX implements what one might call "chunked streaming": it selects a
sequence of subtrees of your document and applies XQuery processing to
each one in turn. (This is effectively the same as saxon:stream() in
Saxon.) You need to have enough memory to hold the largest of these
subtrees. Because your path /xbrli:xbrl effectively selects the whole
document, your largest subtree is the same as the document size, so you
aren't really streaming at all.

If you can describe the query/transformation you want to carry out, then
I might be able to suggest a way of doing it in a streamed manner either
using NUX, or using native facilities of Saxon (whose streaming
capabilities have advanced considerably since NUX was last released).

Michael Kay
Saxonica


2012/4/30 Geet Gangwar<geetgangwar AT gmail.com>
Hi,

I have a requirement of processing large XML files of about 4GB. I am
using
the NUX distribution to process the files.
But when I fire a Xquery to this read this file, I get JAVA Heap Space
error.

I am using 64bit JDK1.6 and also I have increased the JVM size to 5 GB
by
-Xmx5G.

Please help me how to solve this problem.

I am pasting my sample code also.

String path = "/xbrli:xbrl/";
Map prefixes = new HashMap();
prefixes.put("xbrli", "http://www.xbrl.org/2003/instance
");
prefixes.put("link", "http://www.xbrl.org/2003/linkbase";);
prefixes.put("xlink", "http://www.w3.org/1999/xlink";);
prefixes.put("xsd", "http://www.w3.org/2001/XMLSchema";);

StreamingTransform myTransform = new StreamingTransform() {
private Nodes NONE = new Nodes();

// execute XQuery against each element matching
location
path
public Nodes transform(Element subtree) {
Nodes results = XQueryUtil.xquery(subtree,
"xbrli:context[id = 'c-01']");

for (int i=0; i< results.size(); i++) {
// do something useful with query results;
here we
just print them

System.out.println(XOMUtil.toPrettyXML(results.get(i)));
}
return NONE; // current subtree becomes subject to
garbage collection
// returning empty node list removes current
subtree
from document being build.
// returning new Nodes(subtree) retains the current
subtree.
// returning new Nodes(some other nodes) replaces
the
current subtree with
// some other nodes.
// if you want (SAX) parsing to terminate at this
point, simply throw an exception
}
};

// parse document with a filtering Builder
StreamingPathFilter filter = new StreamingPathFilter(path,
prefixes);
Builder builder = new
Builder(filter.createNodeFactory(null,
myTransform));
Document doc = builder.build(new
File("F:/sample/cntxt.xml"));
System.out.println(doc.getRootElement().getValue());
System.out.println("doc.size()=" +
doc.getRootElement().getChildCount());
System.out.println(XOMUtil.toPrettyXML(doc));

Regards

Geet
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