Subject: [xsl] If vs. apply-templates for optional attributes From: "Hunsberger, Peter" <Peter.Hunsberger@xxxxxxxxxx> Date: Fri, 7 Jun 2002 09:32:06 -0500 |
Any opinions on which of the following two ways of adding an optional attribute to an element is more efficient? Method 1 - If: <testelement>> <xsl:if test="@attr != ''"> <xsl:attribute name="attr"><xsl:value-of select="@attr"/></xsl:attribute> </xsl:if> </testelement> Method 2 - Apply templates: <testelement>> <xsl:apply-templates mode="attr" select="."/> </testelement> <xsl:template match="*[@attr]" mode="attr"> <xsl:attribute name="attr"><xsl:value-of select="@attr"/></xsl:attribute> </xsl:template> I have about a dozen spots where I need to do this type of test, so using method 2 ends up reducing the size of the XSLT overall. Also, method 2 can easily be extended, in particular to provide a default value by adding a template like: <xsl:template match="*[not(@attr)]" mode="attr"> <xsl:attribute name="attr">default</xsl:attribute> </xsl:template> where as method 1 has to be converted into a choose block. As a result I've been favoring method 2. However, I thought I should make a sanity check on whether it might have performance implications? It seems to me that method 2 has to be somewhat less efficient, but perhaps not enough to matter? I'll note that one might have to be a little careful on what you push to the modal templates in method 2 (worse case is to add a default template to gobble up anything not wanted), and that might add other performance issues, but in my case that's not an issue... Peter Hunsberger Phone: 901-495-5252 E-mail: Peter.Hunsberger@xxxxxxxxxx XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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