Number can be extracted:
($n)=$c=~/(\d+)\.\d+\.\d+\.\d+$/;
and adjusted:
$n=((($n/2)-5)+1)
<xsl:number count="." level="multiple" from="/page" format="1"/>
Or with format="a", interpret like j=1, l=2, n=3, p=4, etc.
2. Count parents using position()
Simpler -- but apparently this is a weird way to do it. Probably inefficient too.
<xsl:value-of select="count(parent::*/parent::*/parent::*/preceding-sibling::*) - 3"/>
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