[jira] Commented: (XALANJ-2302) Prefix collision bug during serialization

["Brian Minchau (JIRA)" <xa...@xml.apache.org>]

    [ http://issues.apache.org/jira/browse/XALANJ-2302?page=comments#action_12442952 ] 
            
Brian Minchau commented on XALANJ-2302:
---------------------------------------

Per the JIRA triage meeting on Oct 16, 2005, Yash T. agreed to review this patch.

> Prefix collision bug during serialization
> -----------------------------------------
>
>                 Key: XALANJ-2302
>                 URL: http://issues.apache.org/jira/browse/XALANJ-2302
>             Project: XalanJ2
>          Issue Type: Bug
>            Reporter: Brian Minchau
>         Attachments: serializer.patch1.txt
>
>
> 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:
> -------------------------------------------------------------------------------
> 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);
>     }
> }
> -------------------------------------------------------------------------------
> Now there is a problem. When serialized the same prefix cannot be used

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

---------------------------------------------------------------------
To unsubscribe, e-mail: xalan-dev-unsubscribe@xml.apache.org
For additional commands, e-mail: xalan-dev-help@xml.apache.org