[AXIOM-28] OMElement.declareDefaultNamespace() declares empty namespace for child element.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2.8
• Fix Version/s: 1.2.13
• Component/s: LLOM
• Environment: Microsoft Windows 2003 Server, Java 1.5.0_11. Axis2 version 1.3 (uses AXIOM version 1.2.5).
• Assignee: Andreas Veithen
• Reporter: Yechiel Mondrowitz
• Created: 28/Aug/07 20:16
• Updated: 27/Nov/11 23:19
• Resolved: 13/Nov/11 20:52

Description

When calling declareDefaultNamespace() on a parent node, AXIOM assignes a blank namespace on the first level's child element. So if XML is passed to AXIOM that looks like this:

<outerTag>
<innerTag>
<node1>Hello</node1>
<node2>Hello</node2>
</innerTag>
</outerTag>

And then declareDefaultNamespace() of "http://someNamespace" is called on the <outerTag>, the resulting XML will be this:

<outerTag xmlns="http://someNamespace">
<innerTag xmlns="">
<node1>Hello</node1>
<node2>Hello</node2>
</innerTag>
</outerTag>

Notice the xmlns="" declared in the <innerTag>. According to my understanding of XML namespaces, the <innerTag> and its child nodes will no longer belong to the parent namespace of "http://someNamespace", since it explicitly overrides it with an empty namespace. So <innerTag> and its child nodes will in fact not belong to any namespace! Here is a small program to illustrate:

import org.apache.axiom.om.*;
import org.apache.axiom.om.impl.llom.util.*;

public class Test2 {
public static void main(String [] args) {
try

{ String xmlString = "<outerTag>" + "<innerTag>" + "<node1>Hello</node1>" + "<node2>Hello</node2>" + "</innerTag>" + "</outerTag>"; OMElement elem = AXIOMUtil.stringToOM(xmlString); elem.declareDefaultNamespace("http://someNamespace"); System.out.println(elem.toString()); }

catch(Exception e)

{ e.printStackTrace(); }

}
}

The output of this program is this (I added line breaks in the XML for easier readability):

<outerTag xmlns="http://someNamespace">
<innerTag xmlns="">
<node1>Hello</node1>
<node2>Hello</node2>
</innerTag>
</outerTag>

As you can see, the <innerTag> was assigned xmlns="" by AXIOM.

Issue Links

• relates to: AXIOM-376 Axiom should report conflicting namespace declarations