How to I get XML Completion ("Intellisense") for XSLT 1.0?

Start your XSLT Stylesheet with:

<?xml version="1.0" encoding="utf-8"?>

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

      <xsl:template match="/">

      </xsl:template>

</xsl:stylesheet>