XSLT - entities example

xslt-entities.xslt

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE xsl:stylesheet [<!ENTITY netsi "netsi1964@gmail.com">]>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl">

  <xsl:output method="xml" indent="no"/>

  <xsl:template match="/">
    <h1>&amp;netsi; bliver til "&netsi;"</h1>
  </xsl:template>
</xsl:stylesheet>