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xsl:choose to define conditional attributes?

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I'm currently trying to define some conditional processing in
order to be able to derive different values for some attributes 
thanks to <xsl:choose> and <xsl:when>.

For instance, using the transformation to generate some HTML, 
and a <LABEL> tag in the example below, I'd like to do
something like the following:

<label>
  <xsl:attribute name="id">myLabelId</xsl:attribute>
  <xsl:choose>
    <xsl:when test=". = ''">
      <xsl:attribute name="style">MyStyleEmpty</xsl:attribute>
    </xsl:when>
    <xsl:otherwise>
      <xsl:attribute name="style">MyStyleFull</xsl:attribute>
    </xsl:otherwise>
  </xsl:choose>
  The Label
</label>

generating:
<label id="myLabelId" style="MyStyleEmpty">The Label</label>
when the content of the element selected is null, and:
<label id="myLabelId" style="MyStyleFull">The Label</label>
when it's populated with some data.

However the above XSL doesn't seem to work. I suspect it is
because the XSLT WD states that it should be used for templates
only. Ok, but then, how to implement this type of conditional 
processing (and thus to avoid duplicating the whole definition 
of the LABEL tag)?

Thanks for your help,

Olivier.


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