Re: [xsl] rephrased: passing parameters to generic templates

["andrew welch" <andrew.j.welch@xxxxxxxxx>]

On 4/12/06, Robert Frank <robert.frank@xxxxxxxxx> wrote:
> Hi,
>
> I noticed I didn't phrase my problem carefully enough (and the example
> wasn't correct either - thank's David) - probably too late at night:
>
> I want to convert only certain (html) nodes using a generic template,
> but have to pass a parameter to these templates. As the nodes may be
> nested within othernodes, I am using the generic copy 'function'
>
> <xsl:template match="@*|node()|text()" priority="-1">
>     <xsl:param name="path" select="'zz'"/>
>     <xsl:copy>
>       <xsl:apply-templates select="@*|node()|text()">
>         <xsl:with-param name="path" select="$path"/>
>       </xsl:apply-templates>
>     </xsl:copy>
> </xsl:template>
>
> The more specific template is:
>
> <xsl:template match="/content">
>     <test>
>       <xsl:apply-templates select="para">
>         <xsl:with_param name="path" select="docBase"/>
>       </xsl:apply-templates>
>     </test>
> </xsl:template>
>
> and the element I want to change:
>
> <xsl:template match="a/@href">
>     <xsl:param name="path" select="'xx'"/>
>     <xsl:attribute name="href"><xsl:value-of select="$path"/>
>        <xsl:value-of select="."/></xsl:attribute>
> </xsl:template>
>
> A sample xml file could be:
> <content>
>     <para>
>       <docBase>full_path_to_some_directory</docBase>
>       This is a test <b>text</b> which should be copied 1:1.
>       <a href=3D"local_ref">A reference</a>
>       <center><a href=3D"local_ref">A nested reference</a></center>
>     </para>
>     <para>
>       <docBase>next_full_path_to_some_directory</docBase>
>       This is a test <b>text</b> which should be copied 1:1.
>       <a href=3D"local_ref">A reference</a>
>       <center><a href=3D"local_ref">A nested reference</a></center>
>     </para>
> </content>
>
> I want to use the <docBase> in every <para> to modify the href
> of each anhor element.
> How can I propagate the parameter's value in the more specific
> template into the generic template? The only parameter that is
> propagated is the one in the generic template, so all references have
> a value of zz...

No need for parameters here, just select the paras <docBase> when you
match the <a>, eg:

<xsl:template match="a">
  <a href="{ancestor::para/docBase}">.....

Be aware that using the ancestor axis is probably the slowest
solution, so if that's an issue there are faster ways to do this...