JDOM2 - two Namespaces

Question

I am trying to build the following XML structure:

<EDIOrderPackage xmlns="urn:URI" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <Version>1.0.0.0</Version>
    <Test>true</Test>
</EDIOrderPackage>

I use JDOM2 and don't know how to add 2 Namespaces! Even if I set only one Namespace the result is not the same as I wish it to be. If I set the Namespace by root.setNamespace() and use the 2nd one with the prefix i it looks like this:

<i:EDIOrderPackage mlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <Version>1.0.0.0</Version>
    <Test>true</Test>
<i:/EDIOrderPackage>

So there is an i before the EDIPOrderPackage.

If i dont use a prefix is looks like this:

<EDIOrderPackage xmlns="urn:URI">
    <Version xmlns="">1.0.0.0</Version>
    <Test xmlns="">true</Test>
</EDIOrderPackage>

If if try to add it as attributes, it throws the error message that I cannot an attribute with the name "xmlns"

So how can I build an XML with JDOM looking like the one above?

rolfl · Answer 1 · 2014-10-01T23:25:32.850

The trick is that, with Namespaces, you have to specify it correctly for all elements you add.

Additionally, a default Namespace is one that is declared as xmlns="...." and not xmlns:abc="...."

When you use a default namespace, it has no 'prefix' on the elements. So from your example code you have:

The default namespace: xmlns="urn:URI"
The 'i' namespace: xmlns:i="http://www.w3.org/2001/XMLSchema-instance"

You can create these with JDOM as:

Namespace nsDefault = Namespace.getNamespace("urn:URI");
Namespace nsI = Namespace.getNamespace("i", "http://www.w3.org/2001/XMLSchema-instance");

Now, when you create your elements, you have to put them in the right Namespaces:

Element root = new Element("EDIOrderPackage", nsDefault);
Element version = new Element("Version", nsDefault);
Element test = new Element("Test", nsDefault);

root.addNamespaceDeclaration(nsI); // add the i namespace declaration.
root.addContent(version);
root.addContent(test);

If you add the XMLOutputter aspect of things:

Document doc = new Document(root);
XMLOutputter xout = new XMLOutputter(Format.getPrettyFormat());
xout.output(doc, System.out);

the above code produces the output

<?xml version="1.0" encoding="UTF-8"?>
<EDIOrderPackage xmlns="urn:URI" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
  <Version />
  <Test />
</EDIOrderPackage>

JDOM2 - two Namespaces

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