Following this blog post in an attempt to reuse some custom XML developed for SharePoint 2010, I ran into a problem with this technique for outputting raw XML from search in SharePoint 2013. It seems other have had the same issue.
This is what I came up with to help. It's not pretty or perfect, but it'll do for now and gives a "decent" picture of what's going on in the XML.
<xsl:stylesheet version='1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match='/'>
<xsl:apply-templates />
</xsl:template>
<xsl:template match="ResultTable">
<h1>ResultTable</h1>
<xsl:call-template name="out">
<xsl:with-param name="in" select="ResultTable" />
</xsl:call-template>
<xsl:apply-templates select="Rows" />
</xsl:template>
<xsl:template match="Rows">
<h1>Rows</h1>
<xsl:call-template name="out">
<xsl:with-param name="in" select="Rows" />
</xsl:call-template>
<xsl:apply-templates select="Row" />
</xsl:template>
<xsl:template match='Row'>
<h1>Row</h1>
<xsl:call-template name="out">
<xsl:with-param name="in" select="Row" />
</xsl:call-template>
</xsl:template>
<xsl:template name="out">
<xsl:param name="in" />
<table style="border: 1px solid #000;">
<xsl:for-each select="*">
<tr>
<td style="border: 1px solid #000;">
<xsl:value-of select="name()" />
</td>
<td style="border: 1px solid #000;">
<xsl:value-of select="." />
</td>
</tr>
</xsl:for-each>
</table>
</xsl:template>
</xsl:stylesheet>
