Re: Re: Hello XQuery ... Goodbye XSLT?
"DuCharme, Bob (LNG-CHO)" <bob.ducharme@l...> wrote in message FEF4858E8AB32D4EAC2CF2A7D85386EB0B2543A4@l...">news:FEF4858E8AB32D4EAC2CF2A7D85386EB0B2543A4@l...... > Jonathan Robie wrote: >>Dimitre Novatchev > >>> To avoid recursion in tree processing (isn't this what XSLT and XQuery >>> are all about)? This should be impossible by definition. > >>I think you are confusing recursive data structures, which both languages > must be >>able to handle, with recursive algorithms. > > To amplify what Jonathan wrote, by recursion I was referring to algorithms > and not data structures--in particular, the use of XSLT 1.0 named > templates > that call themselves to accomplish things that can be accomplished more > intuitively for most people with procedural code in other languages. For > example, the repetition of something a fixed number of times. And by recursive processing I meant such simple and fundamental things like the identity transformation (XSLT 1.0 terminology): <xsl:template match="@*|node()"> <xsl:copy> <xsl:apply-templates select="@*|node()"/> </xsl:copy> </xsl:template> Overriding the identity template rule (XSLT 2.0 terminology) provides an elegant and powerful pattern for solving a large class of tree transformation problems. Compared to it, the non-recursive solutions are more clumsy and unnatural and in some cases may be very difficult to produce. There are different types of programmers -- it is as difficult for followers of the functional programming school not to use recursion as to use recursion for programmers from the procedural school. But this reflects individual way of thinking -- not the nature of the problems being solved, large group of which are inherently recursive. Cheers, Dimitre. > > When I mentioned XSLT developers who don't use recursion in an earlier > posting, I was referring to the ones who avoid the use of recursive named > templates. > > Bob DuCharme www.snee.com/bob <bob@ > snee.com> weblog on linking-related topics: > http://www.oreillynet.com/pub/au/1191 > > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org <http://www.xml.org>, an > initiative of OASIS <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the subscription > manager: <http://www.oasis-open.org/mlmanage/index.php> > >
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