Java how to parse xml with undeclared namespace?

Each time our new android app released, I need to update app info on our website. So I try to update the app info automatically, by read the AndroidManifest.xml in the apk when uploaded to server.

I use AXMLResource and jdom2 to get the AndroidManifest.xml and parse it.

final Namespace NS = Namespace.getNamespace("http://schemas.android.com/apk/res/android");

zipFile = new ZipFile(apkPath);
ZipEntry zipEntry = new ZipEntry("AndroidManifest.xml");
inputStream = zipFile.getInputStream(zipEntry);
AXMLResource axmlResource = new AXMLResource();
axmlResource.read(inputStream);

SAXBuilder saxBuilder = new SAXBuilder();
Document document = saxBuilder.build(new ByteArrayInputStream(axmlResource.toXML().toString().getBytes("UTF-8")));
Element root = document.getRootElement();
System.out.println(root.getAttributeValue("versionCode",NS));
System.out.println(root.getAttributeValue("versionName",NS));

But I always get,

The prefix “data” for attribute “data:versionCode” associated with an element type “manifest” is not bound

And I print the AndroidManifest.xml,and found the data namespace is unclared.

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    data:versionCode="344"
    data:versionName="3.2.8"

When I check android studio doc and found there use declared namespace.

Then I think this may be caused by our app developers's Irregularities.

But when I think further, why app with AndroidManifest.xml with undeclared namespace can released, then I download some apks like facebook,youtube,centos,baidu disk and alipay, and found only centos doesn't use undeclared namespace.

For com.google.android.youtube.apk

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    http:versionCode="1425572340"
    http:versionName="14.25.57"

The prefix “http” for attribute “http:versionCode” associated with an element type “manifest” is not bound

For com.facebook.katana-225.0.0.47.118.apk

<?xml version="1.0" encoding="utf-8"?>
<manifest
        xmlns:android="http://schemas.android.com/apk/res/android"
        manifest:versionCode="158425934"
        manifest:versionName="225.0.0.47.118"

The prefix “manifest” for attribute "manifest:versionCode” associated with an element type “manifest” is not bound

So here is comman use undeclased namespace in AndroidManifest.xml,but how can I pase it?

from Java how to parse xml with undeclared namespace?