So a simple "../.." won't be reliable.
perhaps this
<x>
<ol>
<li>
<ol>
<li>
<y/>
</li>
</ol>
</li>
</ol>
<ol>
<li><p>
<ol>
<li>
<y/>
</li>
</ol></p>
</li>
</ol>
<ol>
<li>
<ul>
<li>
<ol>
<li>
<y/>
</li>
</ol>
</li>
</ul>
</li>
</ol>
<ol>
<li>
<ul>
<li><p>
<ol>
<li>
<y/>
</li>
</ol></p>
</li>
</ul>
</li>
</ol>
</x>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:f="data:,f"
>
<xsl:variable name="lists" select="QName('','ol'),QName('','ul')"/>
<xsl:strip-space elements="*"/>
<xsl:function name="f:same" as="element()*">
<xsl:param name="n" as="element()"/>
<xsl:sequence
select="$n,$n/ancestor::*[node-name(.)=$lists][1][node-name(.)=node-name($n)]/f:same(.)"/>
</xsl:function>
<xsl:template match="y">
:<xsl:value-of select="count(f:same(../..))"/>
</xsl:template>
</xsl:stylesheet>
$ saxon9 ol.xml ol.xsl
<?xml version="1.0" encoding="UTF-8"?>
:2
:2
:1
:1
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