Re: Understanding named templates and their parameters

[James Clark <jjc@xxxxxxxxxx>]

Michel Goossens wrote:
>
> <xsl:template name="listitem">
>   <xsl:param-variable name="labeltext">labeltext</xsl:param-variable>
>   <xsl:param-variable name="itemid">itemid</xsl:param-variable>
>   <xsl:param-variable name="itemtext">itemtext</xsl:param-variable>
>   <fo:list-item id="{$itemid}">
>     <fo:list-item-label font-style="italic">
>       $labeltext<xsl:text>:</xsl:text>

Character data in a template is copied straight through to the result;
nothing is done with it beyond normal XML parsing. $labeltext is an
expression; you want to put the string value of the expression into the
result.  The way to do that is to use xsl:value-of:

<xsl:value-of select="$labeltext"/>

>     </fo:list-item-label>
>     <fo:list-item-body>
>       <xsl:value-of select="$itemtext"/>
>     </fo:list-item-body>
>   </fo:list-item>
> </xsl:template>
> 
> <xsl:template match='/'>
>  <fo:page-sequence>
>    <xsl:apply-templates/>
>  </fo:page-sequence>
> </xsl:template>
> 
> <xsl:template match="invitation">
> <fo:list-block>
>   <xsl:call-template name="listitem">
>     <xsl:param name="labeltext">To</xsl:param>
>     <xsl:param name="itemid">listto</xsl:param>
>     <xsl:param name="itemtext">to</xsl:param>

This defines the parameter "itemtext" to have a value that's a result
tree fragment containing a single text node with the characters "to". 
Thus when you do <xsl:value-of select="$itemtext"/> you will insert the
characters "to".  What you need is a parameter whose value is a node-set
containing the "to" child of the invitation.  You get that with:

  <xsl:param name="itemtext" expr="to"/>

You could alternatively do:

  <xsl:param name="itemtext"><xsl:value-of select="to"/></xsl:param>

That would give you a parameter that was a result tree fragment
consisting of a text node whose value was the content of the "to" child
of the invitation.

James


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