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RE: [xsl] Re: On XSLT 2.0 Writing Styles
Subject: RE: [xsl] Re: On XSLT 2.0 Writing Styles From: "Michael Kay" <mhk@xxxxxxxxx> Date: Sun, 12 Oct 2003 14:33:56 +0100 |
> I understand the answers to the following questions depend on > how the two stylesheets are written, but assuming they are > done "in a similar way", e.g. the f:foldl example Dimitre provided. > > What about efficiency differences between the two approaches? > Do you think it is likely that an XSLT processor will handle > and process a stylesheet in either syntax the same, or very > similar, way? Will they "compile into the same internal > instructions"? Will the processor be able to apply the same > internal optimizations? Or is it possible that an XSLT > processor will be able handle a stylesheet written in mostly > XPath (or XSLT) more efficiently? At the moment Saxon generally executes XPath expressions using pipelined iterators: a "pull" style that takes maximum advantage of lazy evaluation. Saxon executes XSLT instructions using a completely different "push" style, where the result of the expression is placed on a result tree (or a result sequence) as soon as it is executed. So the performance profiles are likely to be significantly different. However, it's likely that in time there will be more cross-over between these two approaches; there are already some cases where the XSLT instructions are compiled into XPath expressions. In XQuery there is no difference between instructions and expressions and I expect that the difference will gradually disappear in Saxon's internals. Basically I don't think there is any intrinsic reason why one style should be more efficient than the other, but there may be differences in a particular processor at a particular point in time. Michael Kay XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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