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Re: XT extension mechanism
Subject: Re: XT extension mechanism From: info@xxxxxxxxxx (Flow Simulation) Date: Sat, 9 Jan 1999 20:31:43 -0000 |
James Clark wrote: > For this kind of [string-to-string manipulation] extensibility problem, there > could be a special case of xsl:filter that makes things simpler. For > example your particular example could be handled using something like > > <xsl:transform-string script="Number(this)+5"> > <xsl:number/> > </xsl:transform-string> > > xsl:transform-string would be a special case of xsl:filter. It creates > a string from the text content of the result tree fragment being > filtered, applies the script to that string, and replaces the result > tree fragment by a single text node containing the result of evaluating > the script. I _do_ like this. In the trivial case (no children or children not used) it collapses to be equivalent to <eval> but with the script in an attribute. So not only do you get a far more powerful mechanism, but you get a bit of backwards compatibility as well! And as you say, no need for special functions like childNumber(). > Allowing access to the source tree via the DOM has some problems. What > happens if you use the DOM to mutate the source tree? That's really > scary. The source tree would have to be read-only, and that also seems common sense. The implementation would have to somehow enforce this. In general, I think loss of WYSIWYG editor performance is a price worth paying to have scripting available when you need it. One would hope that a good editing tool would gracefully degrade in performance as the extensions were used. Bill Ayers (BillA@xxxxxxxxxx) XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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