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https://issues.apache.org/jira/browse/XALANJ-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533522
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Christine Li commented on XALANJ-2406:
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The patch looks good to me. It resolved the reported problem.
> Unexpected namespace mappings using identity Transformer with DOM flavour
> -------------------------------------------------------------------------
>
> Key: XALANJ-2406
> URL: https://issues.apache.org/jira/browse/XALANJ-2406
> Project: XalanJ2
> Issue Type: Bug
> Components: DOM, Serialization
> Reporter: Brian Minchau
> Fix For: The Latest Development Code
>
> Attachments: serializer.TreeWalker.patch5.txt
>
>
> This isn't exacly a bug, but it is against the serialization "philosophy".
> The serializer stage tries to write out a minimal set of namespace mappings.
> For example if <a> has child <b> and both elements have the namespace node
> that maps prefix "prex" to URI "uri-x" then it tries to serializer the
> document as:
> <a xmlns:prex='uri-x'><b/></a>
> rather than as:
> <a xmlns:prex='uri-x'><b xmlns:prex='uri-x' /></a>
> It isn't that the second form is wrong, it is just that due to the XML
> standard <b> inherits its parent namespace nodes or mappings. The problem
> with the second form is that things can get pretty messy when there are a
> number of namespace nodes and also a deep ancestor tree. Messy and
> potentially a preformance problem with large (lots of characters) output XML.
> Here is a testcase showing this problem:
> import javax.xml.parsers.DocumentBuilder;
> import javax.xml.parsers.DocumentBuilderFactory;
> import javax.xml.transform.TransformerFactory;
> import javax.xml.transform.Transformer;
> import javax.xml.transform.stream.StreamResult;
> import javax.xml.transform.dom.DOMSource;
> import org.w3c.dom.Node;
> import org.xml.sax.InputSource;
> import java.io.*;
> import java.util.Properties;
> public class Test {
> private static final String XML_SOURCE =
> "<doc xmlns:foo='foo'>" +
> "<a xmlns:foo='foo'/>" +
> "</doc>";
>
>
> public static void main(String[] args) throws Exception
> {
>
> DocumentBuilderFactory dfactory =
> DocumentBuilderFactory.newInstance();
> dfactory.setNamespaceAware(true);
> DocumentBuilder docBuilder = dfactory.newDocumentBuilder();
> Node xmlDOM = docBuilder.parse(new InputSource(new
> StringReader(XML_SOURCE)));
>
> String key = "javax.xml.transform.TransformerFactory";
> String value =
> org.apache.xalan.processor.TransformerFactoryImpl.class.getName();
> Properties props = System.getProperties();
> props.put(key, value);
> System.setProperties(props);
>
> Transformer t =
> TransformerFactory.newInstance().newTransformer();
> t.transform(new DOMSource(xmlDOM), new
> StreamResult(System.out));
> }
> }
> Expected result:
> <?xml version="1.0" encoding="UTF-8"?><doc xmlns:foo="foo"><a/></doc>
> Actual result:
> <?xml version="1.0" encoding="UTF-8"?><doc xmlns:foo="foo"><a
> xmlns:foo="foo"/></doc>
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