使用TXMLDocument的XSLT转换

Question

I was trying to use TXMLDocument for XSLT transforming and found unexplained (for me) behavior - TXMLDocument.transformNode does't process the '/' pattern (matched with root node https://msdn.microsoft.com/en-us/library/ms256113(v=vs.85).aspx ).

XML:

<notelist>
  <note>NoteText</note>
</notelist>

Xslt:

<xsl:stylesheet version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml"  indent="yes" encoding="utf-8" />

  <xsl:template match="/">
    <TransformedNoteList>
      <xsl:apply-templates/>  
    </TransformedNoteList>
  </xsl:template>

  <xsl:template match="text()" /> 
</xsl:stylesheet>

Using TXMLDocument Delphi code:

var
  XML: IXMLDocument;
  XSL: IXMLDocument;
  Output: XmlDomString;
begin
  ResultMemo.Clear;

  XML := LoadXMLData(XMLMemo.Text);
  XSL := LoadXMLData(XsltMemo.Text);

  XML.DocumentElement.TransformNode(XSL.DocumentElement, Output);

  ResultMemo.Text := Output;

I expected some thing like this as result:

<?xml version="1.0"?>
<TransformedNoteList></TransformedNoteList>

but got empty xml file.

I tried to reproduce this behavior via using IXslProcessor and all works fine. Can somebody explain me what is using TXMLDocument for transforming because as is understood in not working via IXslProccessor?

Using IXSLProcessor:

var
  XMLDoc, XSLStylesheet: IXMLDOMDocument;
  XSLProcessor: IXSLProcessor;
  XSLTemplate: IXSLTemplate;
begin
  ResultMemo.Clear;

  XMLDoc := CoDOMDocument60.Create;
  XMLDoc.LoadXML(XMLMemo.Text);

  XSLStylesheet := CoDOMDocument60.Create;
  XSLStylesheet.LoadXML(XsltMemo.Text);

  XSLTemplate := CoXSLTemplate60.Create;
  XSLTemplate._Set_stylesheet(XSLStylesheet);
  XSLProcessor := XSLTemplate.createprocessor;
  XSLProcessor.Input := XMLDoc;

  if XSLProcessor.Transform then
    ResultMemo.Text := XSLProcessor.Output;
end;

And what is the correct solution for XSLT transformation?

Answer 1

As Martin says, match="/" matches the top node in the tree (DOM and XPath 2.0 call this a document node, XPath 1.0 calls it a root node). But you have started the transformation by supplying the outermost element in the tree (DOM calls this the document element). To match the outermost element you need the pattern match="/*" .