Configuration By Environment

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" indent="yes" encoding="utf-8" />

  <xsl:template match="*">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <xsl:apply-templates/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="connectionStrings">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <xsl:apply-templates/>
      <add name="Northwind" connectionString="Data Source=ProdServer;Initial Catalog=Northwind;Integrated Security=True"
        providerName="System.Data.SqlClient" />
    </xsl:copy>
  </xsl:template>

  <xsl:template match="appSettings">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <xsl:apply-templates/>
      <add key="Salutation" value="Greetings from the RELEASE environment"/>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>