Subject: RE: [xsl] [XSL] Accessing part of the result tree illustrated with "The Sudoku solver" example. From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Wed, 5 Sep 2007 08:42:37 +0100 |
> But experts as you are, you would have noticed that there is a major > BUG: even when we have found the solution, the recursion continues!.. > So you can get "lucky" and find a solution in the first seconds, then > run for many minutes uselessly just terminating the recursion. A Sudoku puzzle can in general have more than one solution, and I think, without studying it in detail, that your code is written to find all the solutions. If you only want the first solution, the answer is to do: <xsl:variable name="all-solutions" as="..."> ... your algorithm here ... </xsl:variable> <xsl:sequence select="$all-solutions[1]"/> An intelligent pipelined XSLT processor will evaluate $all-solutions lazily, and will recognize the "[1]" as indicating that after finding the first element in $all-solutions, no further processing is needed. Michael Kay http://www.saxonica.com/
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