Unifiers Pega created AXIOM-497:
-----------------------------------
Summary: Removal of namespace declaration breaks type attribute
Key: AXIOM-497
URL: https://issues.apache.org/jira/browse/AXIOM-497
Project: Axiom
Issue Type: Bug
Components: Core Model, OM Mixins
Affects Versions: 1.2.13
Environment: Weblogic 12.2.1.3 version application server
Reporter: Unifiers Pega
Fix For: 1.2.13
When the following XML is converted to an OMElement, then written back out, the
namespace prefix used by the xsi:type attribute refers to the incorrect
namespace URI. That is because the local prefix mapping used in the type name
reference is removed from the element that contains the type attribute during
parsing.
It appears to be caused by a null return value from the getNsBuilder method of
AttributeCollector when it thinks the namespace declaration is redundant.
Original XML:
<ns1:A xmlns:ns1="urn:foo">
<ns1:B xmlns:ns1="urn:bar">
<ns2:C xmlns:ns1="urn:foo" xmlns:ns2="urn:bar"
xmlns:xsi="[http://www.w3.org/2001/XMLSchema-instance]"; xsi:type="ns1:TypeA"/>
</ns1:B>
</ns1:A>
After conversion to OMElement, xsi:type name cannot be resolved because it is
mapped to the wrong namespace URI:
<ns1:A xmlns:ns1="urn:foo">
<ns1:B xmlns:ns1="urn:bar">
<ns2:C xmlns:ns2="urn:bar"
xmlns:xsi="[http://www.w3.org/2001/XMLSchema-instance]"; xsi:type="ns1:TypeA"/>
</ns1:B>
</ns1:A>
Here's some sample code to reproduce the issue:
```
System.out.println("Before StAX parsing:\n"+xmlString);
try {
java.io.StringReader stringReader = new java.io.StringReader(xmlString);
javax.xml.stream.XMLInputFactory inputFactory =
javax.xml.stream.XMLInputFactory.newInstance();
javax.xml.stream.XMLStreamReader streamReader =
inputFactory.createXMLStreamReader(stringReader);
org.apache.axiom.om.impl.builder.StAXOMBuilder builder = new
org.apache.axiom.om.impl.builder.StAXOMBuilder(streamReader);
xmlString = builder.getDocumentElement().toString();
} catch (Exception e) {
System.out.println("Caught exception " + e);
}
System.out.println("After StAX parsing:\n"+xmlString);
```
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