Variable value and functions

I do not remember if this question has been asked before :

I want to get the value of a variable whose name is equal to the value
of the "id" attribute found in the current node. So I tried the
followings :

<xsl:value-of select="$string(@id)"/>

<xsl:value-of select="{$string($id)}"/>

<xsl:value-of select="{$(@id)}"/>


but nothing works.

It would seem that $xxx  requires xxx to be the exact name of a variable
and not an expression capable of calculating that name.

Am I correct?
Is there a workaround?

Thanks,
Emmanuel



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