Subject: RE: [xsl] Whats Wrong with: <xsl:value-of select="//exec[@stepid=$temp_step]/dds/dd[logical/@id=$temp_id]" /> From: "Andrew Welch" <ajwelch@xxxxxxxxxxxxxxx> Date: Thu, 11 Nov 2004 15:46:21 -0000 |
> Friends, > To expand on David's post, I find it easier and less liable > to error to express the variable this way when I want a > string: XLST 1.0 > <xsl:variable name="temp_id">SORTOUT</xsl:variable> The problem here is that you are creating a temporary tree, which has a root and a single text node child. Doing a value-of on the tree will return the string 'SORTOUT', as it returns all the text-nodes for the tree concatenated together, however, there is comparitively massive cost in constructing the tree and the holding it in memory. Using <xsl:variable name="temp_id" select="'SORTOUT'"/> simply binds the string to the variable, and incurs no tree creation costs or the extra memory use. So, although they appear very similar as using value-of on either technique produces the same result, they are actually quite different. The rule of thumb is - if it's possible to do all the work in the select attribute do it there. cheers andrew
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