Subject: RE: Optimisation (was Remove duplicates from a list) From: Kay Michael <Michael.Kay@xxxxxxx> Date: Fri, 29 Oct 1999 09:01:53 +0100 |
> This is entirely conjecture, but I predict that optimization > will follow a similar path as programming language compilers. Yes, though I suspect SQL is a better analogy, because we're dealing with a more declarative language. And it took about 10 years for the theory of SQL optimisation to become refined. There's certainly a lot of scope for optimising single XPath expressions, and in some simple ways products already do. Unfortinately there are lots of features of the language that make it difficult, for example the fact that variables are untyped, and the very strange behaviour of the boolean operators (like the fact that @A=@A can be false). Optimising some other constructs - notably xsl:number - is going to be really hard work, given the way they are defined. One thing that would certainly make optimisation more feasible would be if the stylesheet was bound to a DTD or schema and constrained only to process documents that were valid against that schema. Unfortunately that would be a change to the language. Mike Kay XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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