Prefix collision bug during serialization
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Key: XALANJ-2302
URL: http://issues.apache.org/jira/browse/XALANJ-2302
Project: XalanJ2
Type: Bug
Reporter: Brian Minchau
During work on xalanj-2219, which Henry Zongaro reviewed, he found a related
bug where
an attribute added through manipulation of a DOM would cause a prefix collision.
His testcase was similar to the one in xalanj-2219. First create an element
named "p:child" in namespace URI "child".
When serialized this element would look like this:
<p:child xmlns:p='child' />
Then to this DOM Element, add an attribute named q:attr with value 'val' and
have attribute in the namespace 'moo'.
When serialized this element would look like this:
<p:child xlmns:p='child' q:attr='val' xmlns:q='moo' />
Now to cause the collision have the name of the attribute be 'p:attr'. The
prefix p must map to both 'child' and to 'moo'.
The only way out is to NOT use p for one of the prefixes, and to pick a new one
that is not mapped, something like this:
<p:child xmlns:p='child' ns0:attr='val' xmlns:ns0='moo' />
Henry's testcase, much like the one in xalanj-2219 is this:
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import java.io.StringReader;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;
public class j2219b {
private static final String IDENTITY_XSLT_WITH_INDENT =
"<xsl:stylesheet version='1.0' " +
"xmlns:xsl='http://www.w3.org/1999/XSL/Transform' " +
"xmlns:xalan='http://xml.apache.org/xslt' " +
"exclude-result-prefixes='xalan'>" +
"<xsl:output method='xml' indent='yes' xalan:indent-amount='4'/>" +
"<xsl:template match='@*|node()'>" +
"<xsl:copy>" +
"<xsl:apply-templates select='@*|node()'/>" +
"</xsl:copy>" +
"</xsl:template>" +
"</xsl:stylesheet>";
public static void main(String[] args) throws Exception {
String data = "<p:root xmlns:p='root'/>";
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
Document doc = dbf.newDocumentBuilder().parse(new InputSource(new
StringReader(data)));
Element e = doc.createElementNS("child", "p:child");
e.setAttributeNS("moo", "p:attr", "val");
doc.getDocumentElement().appendChild(e);
Transformer t = TransformerFactory.newInstance().newTransformer(
new StreamSource(new StringReader(IDENTITY_XSLT_WITH_INDENT)));
Source source = new DOMSource(doc);
Result result = new StreamResult(System.out);
t.transform(source, result);
}
}
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Now there is a problem. When serialized the same prefix cannot be used
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