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I would like to store the path of the current node so I can reused it in an expression in XSLT. Is it possible?
<!-- . into $path? -->
<xsl:value-of select="$path" />
No, this is not possible with vanilla XSLT 1.0. There is no easy way to retrieve an XPath expression string for a given node, and there is definitely no way to evaluate a string that looks like XPath as if it was XPath.
There are extensions that support dynamic evaluation of XPath expressions, but these are not compatible with every XSLT processor.
In any case, if you provide more detail around what you are actually trying to do, there might be another way to do it.