The position function returns a number equal to the context position from the expression evaluation context.
position()
An integer equal to the context position from the expression evaluation context.
<xsl:template match="//a[position() = 5]">
<!-- this template matches the fifth a element
anywhere in the document. -->
</xsl:template>
<xsl:template match="//div[@class='foo']/bar[position() = 1]">
<!-- this template matches the first bar element that is
a child of a div element with a class attribute equal to "foo" -->
</xsl:template>
Supported.
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https://developer.mozilla.org/en-US/docs/Web/XPath/Functions/position