Indenting your XSLT output

Ever wondered why the output from your XSLT is not indented even if you use @indent="yes"?
You will need to use extension functions and below are examples how to do it for Xalan and Saxon. Remark: For this to work with Saxon you will need the professional edition.

Saxon:

<xsl:stylesheet version="2.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:saxon="http://saxon.sf.net/"
                extension-element-prefixes="saxon">

    <xsl:output method="xml" saxon:indent-spaces="4" indent="yes"/>

Xalan:

<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:xslt="http://xml.apache.org/xslt">

    <xsl:output method="xml" xslt:indent-amount="4" indent="yes"/>