Re: [xsl] Adding Variables

[Deirdre Saoirse Moen <deirdre@xxxxxxxxxxx>]

I realize this is an old thread, but there was something I'd looked up 
when this thread was new and wasn't certain about.

On Jun 28, 2004, at 4:43 AM, Michael Kay wrote:

> <xsl:variable name="num1" select="//test1/somevalue1"/>
>
> (The compiler can't automatically convert one to the other, because 
> some
> expressions treat them differently, for example boolean($num1) is 
> always
> true in the first case, but in the second case it is true only if
> //test1/somevalue1 selects at least one node).

What I've never quite understood is how to wrap this into a conditional.

Based on http://www.dpawson.co.uk/xsl/sect2/N8090.html#d9711e895 
example, would this be correct for wrapping an assignment in only if a 
variable was passed in, otherwise using the default?

<xsl:variable name="n">
  <!--Conditionally instantiate a value to be assigned to the variable 
-->
  <xsl:choose>
    <xsl:when test=="//test1/somevalue1">
      <xsl:variable name="num1" select="//test1/somevalue1"/>
    </xsl:when>
    <xsl:otherwise>
      <xsl:value-of select="20"/><!-- ...or a "20" -->
    </xsl:otherwise>
  </xsl:choose>
</xsl:variable>

--
_Deirdre                                             http://deirdre.net
"Cannot run out of time. There is infinite time. You are finite. 
Zathras is finite. This....is wrong tool."  -- Zathras