Subject: [xsl] Using memory addressing to retrieve a value vice using a software string library to retrieve a value From: "Costello, Roger L. costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Fri, 20 Nov 2015 12:13:36 -0000 |
Hi Folks, I want to retrieve "west". Which of these is faster? ------------------- Approach #1 ------------------- The <edge> element contains text: <edge>garden west door</edge> "west" is retrieved using this XPath: substring-before(substring-after(., ' '), ' ') Note: assume that <edge> is the context node. ------------------- Approach #2 ------------------- The <edge> element contains markup: <edge> <garden/> <west/> <door/> </edge> "west" is retrieved using this XPath: *[2]/name() I believe that Approach #2 is much, much faster. Do you agree? As I see it, Approach #2 is simply a memory addressing task (which computers do very well) to obtain <west/> and then output the symbols at that memory address. Approach #1, on the other hand, requires the use of software string libraries, which, I imagine, results in hundreds or thousands of machine instructions. In fact, I would imagine that Approach #2 is hundreds or thousands of times faster than Approach #1. Do you agree? /Roger
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