<xsl:variable name="path" select="//level1/level2" />
path is not an expression type in xpath, you can not store unevaluated
expressions in a variable (no more than you can in most other
programming languages) so that variable stores the node set resulting
from evaluating that path at the current node.
<xsl:value-of select="$docdataXML/$path"/>
As the value of $path is a constant, this is the same as
<xsl:value-of select="$path"/>
David
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