Re: [xsl] dynamically set priority in xsl:template

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

On 3/2/07, Georges Schmitz <georges.schmitz@xxxxxxxxx> wrote:
> I want to dynamically set the priority of a template (with
> $expand.level), with the objective to control the "amount of output"
> from outside the stylesheet via parameter setting.
>
>   <xsl:param name="slenderise.level" select="-1" />
>
>   <xsl:template match="@db:type |
>                        @db:size |
>                        @db:nullable"
>                        mode="slenderise"
>                        priority="$slenderise.level" />
>
>   <xsl:template match="@* | node()" mode="slenderise">
>     <xsl:copy>
>       <xsl:apply-templates select="@* | node()" mode="slenderise"/>
>     </xsl:copy>
>   </xsl:template>
>
> But I get this error:
>   XTSE0530: Invalid numeric value for priority (0.0)
>
> Is it not possible at all, to set the priority by a parameter? Because
> it makes no difference if I declare $slenderise.level to be of type
> xs:integer ,xs:double, etc. (which are numbers I suppose) or if I use
> the function number() in the priority attribute. I couldn't find any
> example to such a use case on the net.

Priorities are compile time values, so you can't change them.  Don't
you just need:

<xsl:template match="somenode[$param = -1]"/>

...depending on the number of other priorities in you stylesheet?

If you selectively want to suppress elements through a parameter then
you can do the following:

<xsl:param name="names" as="xs:string"/>
<xsl:variable name="suppress" select="tokenize($names, ' ')" as="xs:string*"/>

<xsl:template match="*[name() = $suppress]"/>

The names of the elements you want to suppress are passed to the
stylesheet as a space separated list, the $suppress variable tokenizes
the list into a sequence of strings, and the no-op template matches
any element with name equal to any item in that sequence.

cheers
andrew