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Re: [xsl] Measuring the complexity of XSLT stylesheets
Subject: Re: [xsl] Measuring the complexity of XSLT stylesheets From: JBryant@xxxxxxxxx Date: Mon, 18 Apr 2005 11:02:08 -0500 |
Jirka makes the following excellent point: ----------------------------------------------------- I think that many people think about XML as about hierarchical way of describing/storing data. XSLT by default traverses XML data from the root to the leaves using templates. If you need to access other axes than child and descendant in your stylesheet, then there is usualy some complexity behind your data from human perspecitive of view. So counting number of XPath expressions that use different axes than child and descendant might give you some metric not completely unrelated to complexity of input data and their processing. Or you can assign different weight to differents axes to make it more "scientific". ----------------------------------------------------- It seems to me that, when you have to pull data from different parts of the hierarchy or output something that isn't based on the source structure, you've got a big jump in complexity. These kinds of problems are usually addressed by Meunchian grouping. Thus, if the stylesheet contains a key, I would add a multiplier to its complexity. You might add another multiplier for variables that contain result tree fragments, though a lot of people do that unintentionally. I strongly suspect that assigning a weight to the length of match expressions and then multiplying by some value for the presence of one or more keys would give you a good measure of a stylesheet's complexity, at least from the point of view of writing and maintaining the stylesheet. Jay Bryant Bryant Communication Services (presently consulting at Synergistic Solution Technologies)
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