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RE: Can I use a boolean variable in an xsl:if test

Subject: RE: Can I use a boolean variable in an xsl:if test
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Tue, 8 Feb 2005 15:58:35 -0000
xsl if test boolean

<xsl:variable name="show">
  <xsl:value-of select = "$time != 60000" />

is not a boolean variable, it is a result tree fragment. If you convert a
result tree fragment to a boolean, the result is always true.

The correct way to write a boolean variable is:

<xsl:variable name="show" select="$time != 60000" />

I simply have no idea why this verbose, inefficient, and often incorrect
style using <xsl:value-of> within <xsl:variable> has become so popular.

Michael Kay

> -----Original Message-----
> From: Ken Goodridge [mailto:goodridgehunting@xxxxxxxxx] 
> Sent: 08 February 2005 15:39
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Can I use a boolean variable in an xsl:if test
>    I've been using the following xsl with success, but
> I am seeing the xsl:if not work properly in another
> installation. In both cases I get
> <debug><show>false</show><time>60000</time></debug>,
> but in one case the noshow shows. Does this code break
> the rules or am I seeing a bug in the xsl transform?
> In both cases I'm using xalan. I can check to see if
> the versions are different if someone thinks that may
> help.
> <xsl:template name="my_template">
>         <xsl:param name="time"/>
> <!-- Don't show if time is one minute -->
> <xsl:variable name="show">
>   <xsl:value-of select = "$time != 60000" />
> </xsl:variable>
> <debug>
>     <show><xsl:value-of select = "$show" /></show>
>     <time><xsl:value-of select = "$time" /></time>
> </debug>
> <xsl:if test="$show">
>     <noshow><xsl:value-of select = "$show" /></noshow>
> </xsl:if>
> </xsl:template>
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> The all-new My Yahoo! - What will yours do?
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