RE: templates with optional paramters

The only way you can determine whether a parameter was actually supplied on
the call is by testing whether the value is different from the default
value. If the caller supplied the default value, you can't tell whether it
was supplied explicitly or defaulted. For example you can define

<xsl:param name="p1" select="'## default ##'/>

and then test
<xsl:if test="$p1='## default ##'">

but you can't tell whether it has this value because the parameter wasn't
supplied, or because the caller supplied this value.

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx]On Behalf Of
> robert.soesemann@xxxxxx
> Sent: 22 March 2002 10:10
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  templates with optional paramters
>
>
> I have an xslt template with 2 paramter. One of them must not
> be specified.
> How can I find out if one or two params where specified? Do I
> need two versions of the template with mode? Or can I check with =''?
>
> <xsl:template name="foo">
>   one mandatory paramter
>   one optional paramter
> ...do things...
> </xsl:template>
>
> One can call it by:
>
> <xsl:call-template name="foo">
>   <xsl:with-param name=="bar_mandatory" select="$whatever" />
>   <xsl:with-param name="bar_optional" select="$whatever" />
> </xsl:call-template>
>
> OR
>
> <xsl:call-template name="foo">
>   <xsl:with-param name=="bar_mandatory" select="$whatever" />
> </xsl:call-template>
>
>
> Rob
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