Hello World (XSL)

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XSLT transformations permit us to add extra layers to source data.

Using mode="text output" 

<<hello-world-text.xsl>>=
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
        <xsl:output method="text"/>
        <xsl:template match="/">
                <xsl:apply-templates mode="passone"/>
                <xsl:apply-templates mode="passtwo"/>
                <xsl:call-template name="recurse">
                        <xsl:with-param name="num">
                                <xsl:value-of select="1"/>
                        </xsl:with-param>
                </xsl:call-template>
        </xsl:template>
        <xsl:template match="exchange" mode="passone">
                <xsl:text>Bugs says: </xsl:text><xsl:value-of select="greeting" /><xsl:text>
</xsl:text>
        </xsl:template>
        <xsl:template match="exchange" mode="passtwo">
                <xsl:text>Daffy says: </xsl:text><xsl:value-of select="response" /><xsl:text>
</xsl:text>
        </xsl:template>
        <xsl:template name="recurse">
                <xsl:param name="num">1</xsl:param>
                <xsl:if test="not ($num = 11)">
                        <xsl:text><xsl:value-of select="$num" />
</xsl:text>
                        <xsl:call-template name="recurse">
                                <xsl:with-param name="num">
                                        <xsl:value-of select="$num + 1"/>
                                </xsl:with-param>
                        </xsl:call-template>
                </xsl:if>
        </xsl:template>
</xsl:stylesheet>

<<hello-world-text.xml>>=
<exchange>
  <greeting>What's up, doc?</greeting>
  <response>Oooooo, you're despicable!</response>
</exchange>

The xml file and the xsl translation produce the following output: 

Bugs says: What's up, doc?
Daffy says: Oooooo, you're despicable!
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Using a web browser to generate XHTML

You specify the xsl stylesheet in the xml-stylesheet Processing Instruction. 

<<hello-world.xml>>=
<?xml version="1.0" encoding="iso-8859-1"?>
<?xml-stylesheet href="hello-world.xsl" type="text/xsl" ?>
<doc>
   <title>Hello World Test</title>
   <hello>World</hello>
</doc>

You should be careful with namespace definitions, or it will not work on Mozilla. 

<<hello-world.xsl>>=
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0" 
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns="http://www.w3.org/1999/xhtml">
  <xsl:output 
    method="xml"
    encoding="iso-8859-1"
    indent="yes"
    doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
    doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
  />
  <xsl:template match="/">
    <html>
      <head>
        <title><xsl:value-of select="doc/title"/></title>
      </head>
      <body>
        <p>Hello <xsl:value-of select="doc/hello"/></p>
      </body>
    </html>
  </xsl:template>
</xsl:stylesheet>

With the two files on the same directory you open the xml file with the browser or call its URL if it is in a web zone.

The browser transforms the source nodes with the xsl templates acting as if it had received the following result: 

<<hello-world.html>>=
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
  <head>
    <title>Hello World Test</title>
  </head>
  <body>
    <p>Hello World</p>
  </body>
</html>

With "Literal Result" XSL

For simple transformations (only one template: root) you can use the "Literal Result Element" style which permits to have the standalone template contents in a file that looks like having the result format with xsl embedded instructions. 

<<hello-world-lr.xsl>>=
<html xsl:version="1.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
      xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title><xsl:value-of select="doc/title"/></title>
  </head>
  <body>
    <p>Hello <xsl:value-of select="doc/hello"/></p>
  </body>
</html>

Substitute the stylesheet filename in the source xml file and retry to see the result of the literal result xsl transformation.

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