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The planets.xsl stylesheet we've been working with doesn't use the
<xsl:output> element; it turns out that I've been relying on the default
output rules with that stylesheet. By default, the output type is XML, unless the XSLT
processor sees an <HTML> or <html> tag. (Note that
this is not a formal requirement, just a convention, so you can't expect all XSLT processors
to honor it.) I've used the <HTML> tag in planets.xsl like this:
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/PLANETS">
<HTML>
<HEAD>
<TITLE>
The Planets Table
</TITLE>
</HEAD>
.
.
.However, if you remove this tag:
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/PLANETS">
<HEAD>
<TITLE>
The Planets Table
</TITLE>
</HEAD>
.
.
.Then this is the kind of output you'll get from James Clark's XT. Note the XML processing instruction at the beginning:
<?xml version="1.0" encoding="utf-8"?>
<HEAD>
<TITLE>
The Planets Table
</TITLE>
</HEAD>
.
.
.On the other hand, you can explicitly specify the output type as HTML with the
<xsl:output> element, even without using the <HTML> element:
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html"/>
<xsl:template match="/PLANETS">
<HEAD>
<TITLE>
The Planets Table
</TITLE>
</HEAD>
.
.
.Here's the output from XT in this case-just an HTML fragment, no XML processing instruction:
<HEAD>
<TITLE>
The Planets Table
</TITLE>
</HEAD>
.
.
.Automatic
<meta>Elements Added to HTML
If you do use the<xml:output method="html"/>element explicitly, some XSLT processors, such as Saxon, add a<meta>element to the output document's<head>element something like this:
<meta http-equiv= "Content-Type" content="text/html; charset=utf-8">.
In general, XSLT processors are supposed to realize that certain elements,
such as <br>, <img>, <frame>,
and so on are empty in HTML. Also, spaces and other characters in URI attribute values
are converted as specified in the HTML specification (a space becomes "%20" and so on),
processing instructions are terminated with > rather than ?>,
and the fact that standalone attributes are not assigned a value is recognized.
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Created: October 11, 2001
Revised: October 11, 2001
URL: http://webreference.com/authoring/languages/xml/insidexslt/chap2/5/2.html
