Recently, while utilizing XSLT for one of my projects, I came across this issue when I needed to auto-increment a variable for my records. After a bit of Google searching, I came across a somewhat usable method, which I improved upon to get this:

We first insert a node in our XSL under the node where we want the variable to be auto-incremented:

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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<ul class="flickrGallery">
<xsl:variable name="my_var">
<xsl:value-of select="position()"/>
</xsl:variable>
<xsl:for-each select="//photo">
    ...

Now, we will actually be printing the value of this variable as below:

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<xsl:attribute name="rel">flickr<xsl:copy-of select="$my_var" /></xsl:attribute>