Subject: RE: [xsl] Using "except" with node sequences From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Mon, 4 Aug 2008 20:02:04 +0100 |
> Also, thanks Michael for your suggestion. The code I posted > was a simplified form of my actual code, in which I'm > combining two sequences produced by two different functions, > both of which are a bit complex for a single predicate: > > select="$active_data except $new_data" > > Both of these variables are constructed by functions executed > on the original $normalized_data variable. Both use > <xsl:sequence /> to return a sequence of elements. My > impression was that by using <xsl:sequence />, I am returning > references to the existing nodes in $normalized_data, and not > actually creating copies of those nodes in memory. Is this > in fact the case? yes. > > An alternate method I considered was to create Boolean > functions that would allow me to construct a predicate like > you suggested: > > select="$normalized_data[fn:active(.) and not(fn:new(.)] > > But since I use $active_data and $new_data elsewhere in my > stylesheet, I decided against it, trying to avoid evaluating > those Boolean functions more than necessary. > > In general, which approach is better practice? I would think the boolean function probably gives better reusability. Michael Kay http://www.saxonica.com/
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