<xsl:processing-instruction name=”process-name” > </xsl:processing-instruction>
The xsl:processing-instruction element writes (generates) a processing instruction to the output. The content of this element becomes the text of the processing instruction. The syntax is:
<xsl:processing-instruction name=”pi_name”>

processing instruction text goes here …


This text should not contain any character references. In other words, all characters must be directly represented by the selected character encoding (i.e., an < cannot be represented by an <).
This is not a self-closing element. The separate closing element is mandatory.
The mandatory name attribute is the name of the processing instruction. The name cannot contain acolon (:).
Processing instructions are rarely used in XML. However, the W3C standard permits the application of a CSS (Cascading Style Sheet) file to an XML document. This is accomplished with an <?xml_stylesheet … ?> processing instruction which is directly compariable to the HTML <link type=”text/css” href=”style.css> tag.
This code fragment demonstrates how to do this:
<xsl:processing-instruction name=”xml-stylesheet”>

type=”text/xsl” href=”style_rules.css” title=”Large Print”


This creates the following tag:
<?xml-stylesheet href=”style_rules.css” type=”text/css” title=”Large Print”?>
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