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Attn Mike Kay (was using dom.Document as SAXON source)

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Kay Michael wrote:
> 
> > Is it possible to apply SAXON to DOM documents using the public
> > API? I had a look through the Stylesheet and Controller source,
> > and it looks like SAXON builds something resembling a DOM before
> > applying templates, but it uses a class (DocumentImpl) which
> > doesn't explicitly implement any org.w3c.dom interfaces.
> 
> No, this is not currently possible... <snip />

Thanks, fair enough. I'm now looking at not using DOM and XQL, but your
DocumentInfo class and XPath expressions for querying. This should
mean that I can perform queries and then transform without having to
go through the DOM->SAX->DocumentInfo transformations. I haven't had
much of a chance to try it yet, but on paper it looks good.

The other problem I've encountered is with XMLEmitter, which calls
close() on the Writer it is using inside the endDocument() method.
I'm not sure if this is a good idea, mainly because that class is
not responsible for calling open() (or init()) in the first place.
It also prevents people from outputting more data using that writer.

This is important to me, because I've been working (for about a year
now) on an XML/XSL/XQL server (there's an old version which uses the
DataChannel parser available at
http://www.esc.auckland.ac.nz/People/Staff/Hedley/dcxjpServer/index.html
). I use a PrintWriter wrapped around a socket's output stream to pass
XML data to my CGI scripts, and this data may include multiple query and
XSLT results.

This problem even prevents me (I think) from outputting two XSLT results
to System.out. Feel free to tell me what's wrong with the following code,
which stops outputting anything to standard out, after the first source
document has been rendered.

Any ideas?

=== BEGIN CODE

import java.io.*;

import com.icl.saxon.*;
import com.icl.saxon.output.*;
import org.w3c.dom.*;
import org.xml.sax.*;


public class SaxonTest
{
  public static void main(String argv[]) throws Exception
  {
    String xmlData = "<?xml version=\"1.0\"?>\n<!DOCTYPE data>\n<data>\n" +
      "<element>text 1</element>\n<element>text 2</element>\n</data>\n";
    String xslData = "<?xml version=\"1.0\"?>\n" +
      "<xsl:stylesheet xmlns:xsl = \"http://www.w3.org/1999/XSL/Transform\" " +
      "version = \"1.0\">\n" +
      "  <xsl:template match=\"/\">\n" +
      "    <root>\n" +
      "      <xsl:text>\n</xsl:text>\n" +
      "      <xsl:for-each select=\"data/*\">\n" +
      "        <xsl:text>name = `</xsl:text>\n" +
      "        <xsl:value-of select=\"name()\" />\n" +
      "        <xsl:text>`, data = `</xsl:text>\n" +
      "        <xsl:value-of select=\".\" />\n" +
      "        <xsl:text>`\n</xsl:text>\n" +
      "      </xsl:for-each>\n" +
      "    </root>\n" +
      "  </xsl:template>\n" +
      "</xsl:stylesheet>\n";

    OutputDetails   output        = null;
    StyleSheet      stylesheet    = null;

    output = new OutputDetails();
    output.setWriter(new PrintWriter(System.out));

    stylesheet = new StyleSheet();
    stylesheet.setOutputDetails(output);
    stylesheet.prepareStyleSheet(new InputSource(new StringReader(xslData)));

    System.out.println("render 1\n======");
    stylesheet.renderSource(new InputSource(new StringReader(xmlData)));
    System.out.println("\n======");

    output     = new OutputDetails();
    output.setWriter(new PrintWriter(System.out));

    stylesheet = new StyleSheet();
    stylesheet.setOutputDetails(output);
    stylesheet.prepareStyleSheet(new InputSource(new StringReader(xslData)));

    System.out.println("render 2\n======");
    stylesheet.renderSource(new InputSource(new StringReader(xmlData)));
    System.out.println("\n======");
  }

} /* class SaxonTest */

=== END CODE



-- 
Warren Hedley
Department of Engineering Science
Auckland University
New Zealand


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