It is because we can not write the DOCTYPE element in the xslt file, it's not a well-formed xml element. To achieve this goal you must use xsl:output, just as below<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output
method="html"
encoding="utf-8"
doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" />
<xsl:template match="/">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
The result is something like:<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title></title>
</head>
<body>
</body>
</html>
in the xsl:output element:
method: identifies the method that should be used for outputting the result, it can be one of xml, html or text.
encoding: specifies the preferred character encoding that the XSLT processor should use to encode sequences of characters as
sequences of bytes
doctype-public: specifies the public identifier to be used in the document type declaration. If given this attribute it will generate a DOCTYPE in the output document, such as <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
doctype-system: specifies the system identifier to be used in the document type declaration. If given this attribute it will generate a DOCTYPE in the output
document, such as <!DOCTYPE html SYSTEM "./dtds/book.dtd">
If both the doctype-public and doctype-system attributes are specified in the xsl:output element, for example, <xsl:output
method="html" doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
/> will generate the DOCTYPE like: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">. In this situation the doctype-system only identifies the resource(DTD) referenced.
cdata-section-elements: specifies a list of the names of elements whose text node children should be output using CDATA sections, for example, cdata-section-elements="script" will result in all the text in the elements <script></script> are treated just as they are in <![CDATA[]]> by the XSLT processor.
The c# code handling the transformation is below:using System;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.XPath;
using System.Text;
using System.IO;
this.Response.ContentType = "text/html";
//retrieve the xml document object from the model
XmlDocument doc = BoxImpl.BoxXml(this._templateId, this._type, this._boxId, this._op);
//in .NET framework 2.0, it is recommended that use the XslCompiledTransform instead of XslTransform
XslCompiledTransform transform = new XslCompiledTransform();
transform.Load(this.Server.MapPath("cc.xsl"));
MemoryStream stream = new MemoryStream();
transform.Transform(doc.CreateNavigator(), null, stream);
//maybe the Position was moved to the end of the MemoryStream while transforming,
//so it's necessary to set this attribute to 0 before reading the stream
stream.Position = 0;
//the encoding attribute specified in the xsl:output node is utf-8,
//so here we read the output stream using the System.Text.Encoding.UTF8 correspondingly
StreamReader reader = new StreamReader(stream, System.Text.Encoding.UTF8);
this.Response.Write(reader.ReadToEnd());
reader.Close();
stream.Close();
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