[jira] Commented: (XALANJ-1752) DOMResult(Node) fails for Element when transform outputs more than one root node.

[xalan-dev]

The following comment has been added to this issue:

     Author: Alexei Yudichev
    Created: Mon, 20 Sep 2004 6:34 AM
       Body:
new DOMResult(Element) constructor, according to its JavaDoc, is supposed to allow 
any, even non-single-rooted output to be appended to the element node passed (however, 
this is not stated implicitly). I can't see the restriction of a single root here. In 
contrast, new DOMResult(Document) and new DOMREsult() constructors restrict 
transformation output to be a single-rooted tree. Most likely, this is the specs gap 
somewhere here. But:

1) looking at xalan's DOMBuilder code, I can clearly see that current node variable is 
initialized with the element passed as parameter to new DOMResult(Element), however, 
after the first output Element is processed (SIC! DOMBuilder will allow any number of 
text nodes before the first element, but will throw an exception when attempting to 
output the second Element!), current node is set to null, rather than returning to 
previous value.

2) Saxon allows that

3) Allowing to append more than one node to Element sounds quite logical
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  http://issues.apache.org/jira/browse/XALANJ-1752?page=comments#action_53237

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View the issue:
  http://issues.apache.org/jira/browse/XALANJ-1752

Here is an overview of the issue:
---------------------------------------------------------------------
        Key: XALANJ-1752
    Summary: DOMResult(Node) fails for Element when transform outputs more than one 
root node.
       Type: Bug

     Status: Unassigned
   Priority: Blocker

    Project: XalanJ2
 Components: 
             DOM
   Versions:
             2.5

   Assignee: 
   Reporter: Josh Canfield

    Created: Thu, 18 Dec 2003 1:23 AM
    Updated: Mon, 20 Sep 2004 6:34 AM
Environment: Operating System: All
Platform: All

Description:
When using a DOMResult with an Element as the parameter a SAXException (Can't 
have more than one root on a DOM!) when the template evaluates to more than a 
single first level node. The following code/xml/xsl demonstrates the problem.

### test.java

import java.io.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.dom.*;

import org.w3c.dom.*;
import org.apache.xerces.dom.DocumentImpl;
import org.apache.xml.serializer.*;

public class test {
        static public void main(String[] args) {
                try {
                        // Create xsl source
                        StreamSource xslSource = new StreamSource(new File(args
[0]));
                        // Create xml source
                        StreamSource xmlSource = new StreamSource(new File(args
[1]));

                        // Create transformer
                        TransformerFactory tFactory = 
TransformerFactory.newInstance();
                        /// output the xslt
                        Transformer transformer = tFactory.newTransformer
(xslSource);

                        // Create document
                        // <ui><listbox><model/></listbox></ui>
                        Document doc = new DocumentImpl();
                        Element ui = doc.createElement("ui");
                        Element listbox = doc.createElement("listbox");
                        Element model = doc.createElement("model");
                        doc.appendChild(ui);
                        ui.appendChild(listbox);
                        listbox.appendChild(model);

                        DOMResult dr = new DOMResult(model);
                        transformer.transform(xmlSource, dr);
                        
                        // Dump to System.out
                        Transformer identity = tFactory.newTransformer();
                        identity.setOutputProperty("indent","yes");
                        identity.setOutputProperty("{http://xml.apache.org/xslt}
indent-amount","4");
                        identity.transform(new DOMSource(doc), new StreamResult
(System.out));

                } catch ( Exception e ) {
                        e.printStackTrace();
                }
        }
}

### xml.xml

<?xml version="1.0" encoding="UTF-8"?>

<addrList>
        <address>
                <name>One</name>
                <name>Two</name>
                <name>Three</name>
                <name>Four</name>
        </address>
</addrList>

### xsl.xsl

<?xml version="1.0"?>

<xsl:stylesheet 
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
        version="1.0">
<xsl:output method="xml" indent="no"/>
  <xsl:template match="/">
                <xsl:copy-of select="addrList/address/name"/>
        </xsl:template>
</xsl:stylesheet>


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