RE: choose to define conditional attributes?

> <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>

http://www.w3.org/TR/xslt#creating-attributes says, "Instantiating an
xsl:attribute element adds an attribute node to the containing result
element node". It's not terribly clear, but the "containing" node is the
<xsl:attribute>'s parent, which is <xsl:when> in your example. You want the
parent to be a result element, i.e. a literal result element like <label> or
an <xsl:element> instruction.

Furthermore, <xsl:choose>...</xsl:choose> gets replaced by characters. If
there were some non-whitespace characters in the <xsl:when> or
<xsl:otherwise>, you'd end up with those being inserted right before "  The
Label" in the content of <label>. You really want the characters to end up
inside your <xsl:attribute>.

Try it this way instead:

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


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