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Re: [xsl] Data-driven XSLT code using dynamic mode values?

2013-08-02 10:41:11
Seems like you want to use FXSL (for either XSLT 1.0 or 2.0) and HOFs
for XSLT 3.0.

As for "data-driven", maybe the "fill-in-the-blanks" (forms with
variables replacement) technique would be useful.

Cheers,
Dimitre

On Fri, Aug 2, 2013 at 7:26 AM, Costello, Roger L. 
<costello(_at_)mitre(_dot_)org> wrote:
Hi Folks,

I want to have multiple templates for the same element, each template 
processes the element differently.

"Use modes," you say.

Okay, sounds good. So I will have multiple template rules:

    <xsl:template match="Header" mode="Remove">

    <xsl:template match="Header" mode="Replace">

    <xsl:template match="Header" mode="Reject">

Now let's turn to the problem of firing the appropriate template rule.

I have a variable which has a value that indicates whether I should do a 
Remove, Replace, or Reject:

    <xsl:variable name="action" select="get the action from an XML file" />

I want to fire a template rule based on the value of $action.

Here's what I really, really want to do:

    <xsl:apply-templates select="." mode="$action" />

That would be so cool. That would truly be "data-driven code."

Unfortunately, using a variable as the value of @mode is not allowed.

Bummer.

Is my only solution to use xsl:choose:

          <xsl:choose>
              <xsl:when test="$action eq 'Remove'">
                  <xsl:apply-templates select="." mode="Remove" />
              </xsl:when>
              <xsl:when test="$action eq 'Replace'">
                  <xsl:apply-templates select="." mode="Replace" />
              </xsl:when>
              <xsl:when test="$action eq 'Reject'">
                  <xsl:apply-templates select="." mode="Reject" />
              </xsl:when>
          </xsl:choose>

That is an awful solution. It is brittle and not extensible code.

Please, please show me a better way than using xsl:choose.

/Roger


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-- 
Cheers,
Dimitre Novatchev
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Truly great madness cannot be achieved without significant intelligence.
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To avoid situations in which you might make mistakes may be the
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