XML/XSLT translation - how to read attribute with calculated name?

Hi.

I need to get in XSLT an attribute with dynamically calculated name.
So, need to do something like this:

<xsl:variable name="attrName" select="concat('@', name())" />
<xsl:choose>
  <xsl:when test="//ColumnsRenamer/$attrName != ''">
    <xsl:value-of select="//ColumnsRenamer/$attrName" />
  </xsl:when>
  <xsl:otherwise>
    <xsl:value-of select="name()" />
  </xsl:otherwise>
</xsl:choose>

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In other words - in the XML like this:

<Document>
  <ColumnsRenamer Field1="Some other name"/>
  <Record>
    <Field1>111</Field1>
    <Field2>222</Field2>
  </Record>
</Document>

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When processing the <Field1> XML element I need to read a "Field1" attribute from another XML element.

Is it possible to do with standard XSTL features? I mean - it should works in any web browser (almost in any, enough if it will work in IE, FireFox, Opera).

This XSLT code sample seems does not work. It is reporting "XSLT Compile error at <xsl:when test="//ColumnsRenamer/$attrName != ''">".

Regards,
Dmitry.