[xsl] How to use an xsl:variable in select= of another xsl:variable

[Rene de Vries <RdVries@xxxxxxxxxxx>]

Hi XSL-ers,

Another question for you I hope you can answer.

first I fill 2 xsl:variables:

first XML:
       <xsl:variable name="ancestor" select="ancestor::xsd:complexType/@name"/>
       <xsl:variable name="naam" select="@name"/>

I checked and these xsl:variables are filled correctly.

and I want to use these as follows:

       <xsl:variable name="ShrtDescr" select="document('Descriptions.xml')/Descriptions/$ancestor/$naam/DescriptionShort" />

to be able to show the description from the second Descriptions-xml:

        Short Description: <xsl:value-of select="@ShrtDescr"/>

But XML-spy doesn't accept the $.. in the select=... 
What to do?

Greoetings Rene
   { @   @ }
        ^
      \__/

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