Incorrect default namespace serialization for un-prefixed attribute.
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                 Key: WSCOMMONS-99
                 URL: http://issues.apache.org/jira/browse/WSCOMMONS-99
             Project: WS-Commons
          Issue Type: Bug
          Components: AXIOM
         Environment: Windows
            Reporter: Toshiro Takase
            Priority: Critical


Current serialization prints default namespace declaration for un-prefixed 
attributes.
According to "Namespaces in XML 1.0",
http://www.w3.org/TR/REC-xml-names/#defaulting
        "Default namespace declarations do not apply directly to attribute 
names."
        "The namespace name for an unprefixed attribute name always has no 
value."
So the default namespace declaration should not be printed.
I am afraid that this serialization sometimes breaks XML signature and XML 
Infoset.

This is my test code.
----------
        OMFactory factory = OMAbstractFactory.getOMFactory();
        OMDocument doc = factory.createOMDocument();
        OMElement elem1 = factory.createOMElement("local1", "ns1", "");
        doc.addChild(elem1);
        OMElement elem2 = factory.createOMElement("local2", "ns2", "pre2");
        elem1.addChild(elem2);
        elem2.addAttribute("attrLocal", "attrValue", null);
        OMElement elem3 = factory.createOMElement("local3", 
elem1.getNamespace());
        elem2.addChild(elem3);
        doc.serialize(System.out);
----------

The result is here. (indented for readability)
----------
<?xml version="1.0" encoding="utf-8"?>
<local1 xmlns="ns1">
    <pre2:local2 xmlns="" xmlns:pre2="ns2" attrLocal="attrValue">
        <local3 xmlns="ns1"/>
    </pre2:local2>
</local1>
----------

In my understanding, this should be the following.
----------
<?xml version="1.0" encoding="utf-8"?>
<local1 xmlns="ns1">
    <pre2:local2 xmlns:pre2="ns2" attrLocal="attrValue">
        <local3/>
    </pre2:local2>
</local1>
----------


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