Subject: Re: [xsl] deep copy without attributes From: Graydon <graydon@xxxxxxxxx> Date: Tue, 21 May 2013 05:52:49 -0400 |
On Tue, May 21, 2013 at 01:35:54AM +0100, Ihe Onwuka scripsit: > On Tue, May 21, 2013 at 12:02 AM, Graydon <graydon@xxxxxxxxx> wrote: > > <xsl:template match="node()"> > > <xsl:copy> > > <xsl:apply-templates select="node()"/> > > </xsl:copy> > > </xsl:template> > > > > does that; it's not recursive, it's a single template. It'll get > > applied to all the nodes, but that's the magic of the XSLT declarative > > if it were only about whether cognoscenti can think up an elegant > solution - we'd still all be doing Muenchian Grouping. To know about Muenchian Grouping, which is not, alas, elegant, merely effective, and not know about the identity template seem really odd. I would also note that understanding the xsl:for-each-group instruction is in no way obviously easier than understanding Muenchian Grouping! More capable, more readily applied, I think more powerful even in the fully formal sense, yes, but it's not an easy instruction to understand. Identity template processing is surely basic; one of the four basic patterns for an XSLT program, and I'd argue the _most_ basic of those four. Really not wanting to deal with the declarative model, well, yes. That is certainly widely observed. But XSLT _is_ the declarative model. > I've not been paying attention to 3.0 but I'd be looking at copy-of > and thinking it is ripe for accepting an anonymous function/template > that is applied as it traverses it's hierarchy. which would be another > way of addressing the issue. Which would be a horrible mistake; copy-of is useful in significant part because it is a way to say "the whole subtree, you don't have to think about it" to the optimizer. Thinking of XSLT programming as a conversation with the optimizer isn't entirely basic, but it's a good habit all the same. -- Graydon Saunders graydon@xxxxxxxxx
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