Re: recursive passing parameter

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 99/09/07 11:50 -0400, Honglin Su wrote:
> I want the following stylesheet to produce an output like this:
>
>  The variable value before passing is:: init value ...
>  The variable value after passing is :: A1
>  The variable value before passing is:: A1
>  The variable value after passing is :: B1
>  The variable value before passing is:: B1
...
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/XSL/Transform/1.0";>
> <xsl:variable name="var" select="'init value ...'" />
> <!-- process the children recursively -->
> <xsl:template match="*">
>  The variable value before passing is:: <xsl:value-of select="$var"/>
>  <xsl:param name="var" select="name(.)"/>
>  The variable value after passing is :: <xsl:value-of select="$var"/>
>  <xsl:apply-templates/>
> </xsl:template>
...
> But the actually output is that every before passing value is 'init
> value ...". What's wrong with my stylesheet?

The stylesheet is giving you what you are asking for because the scope of 
"$var" at the beginning of <xsl:template> is the globally scoped variable, 
not the locally scoped variable.

Once you declare the $var within the template, subsequent references in 
that template are to that locally scoped variable.

Perhaps your misunderstanding is the expectation that the value of the 
variable $var actually varies ... it does not vary.  The <xsl:param> is 
declaring a variable and is supplying a default value to bind to that 
variable if the <xsl:apply-templates> or <xsl:call-templates> doesn't 
provide a <xsl:with-param> value as an overriding value to bind.

Once a value is bound to the variable, it does not change.

What you are seeing is a question of the scope of your variable reference, 
not an issue of variable values.

I hope this helps.

............ Ken



--
G. Ken Holman                    mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd.             http://www.CraneSoftwrights.com/s/
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                             1999-12-07, 2000-02-27/28, 2000-05-11/12



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