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Finally, you can get rid of templates that match elements that are never selected for processing. Remember that a template is never actually used if the processor never gets told to apply templates to a node that matches that template. A template that is never matched will never be used, and can therefore be safely removed.
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TVGuide9.xsl does contain a few templates that aren t really necessary, and to make it easier to understand we could prune it to create TVGuide10.xsl. There are three templates that do the same thing as the built-in templates, and just contain an <xsl:apply-templates> or an <xsl:value-of> instruction that gives the value of the current node. They are the one matching <Name> element children of <Character> elements, the one matching <Name> element children of <Actor> elements, and the one matching <Description> element children of <Program> elements you can safely delete them: <xsl:template match="Character/Name"> <xsl:value-of select="." /> </xsl:template> <xsl:template match="Actor/Name"> <xsl:value-of select="." /> </xsl:template> <xsl:template match="Program/Description"> <xsl:apply-templates /> </xsl:template> We identified the template matching <Channel> element children of the <TVGuide> element as falling into the second category. It had two <xsl:apply-templates> in it, but these selected nodes in the same order as they occurred in the input document, essentially the same as applying templates to all the children, which again is just what the built-in templates do. So you can safely delete the following template: <xsl:template match="TVGuide/Channel"> <xsl:apply-templates select="Name" /> <xsl:apply-templates select="Program" /> </xsl:template> Finally, in TVGuide9.xsl there are two templates that can never be applied the one matching <Description> elements within <Character> elements, and the one matching <Description> elements within <Actor> elements. These templates will never get activated because the templates that match <Character> and <Actor> elements (within <CastMember> elements) never apply templates to their child <Description> elements. So these two templates can also be deleted: <xsl:template match="Character/Description" /> <xsl:template match="Actor/Description" /> Once you ve done all that, you should have something like the stylesheet shown in Listing 3-6, TVGuide10.xsl. The ordering of the templates within the stylesheet doesn t matter.
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Listing 3-6. TVGuide10.xsl < xml version="1.0" encoding="ISO-8859-1" > <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="/"> <html> ... </html> </xsl:template> <xsl:template match="Channel/Name"> <h2 class="channel"><xsl:value-of select="." /></h2> </xsl:template> <xsl:template match="Channel/Program"> <div> ... </div> </xsl:template> <xsl:template match="Program/Series"> <span class="title"><xsl:value-of select="." /></span> </xsl:template> <xsl:template match="CastMember"> <li> <xsl:apply-templates select="Character" /> <xsl:apply-templates select="Actor" /> </li> </xsl:template> <xsl:template match="CastMember/Character"> <span class="character"> <xsl:apply-templates select="Name" /> </span> </xsl:template> <xsl:template match="CastMember/Actor"> <span class="actor"> <xsl:apply-templates select="Name" /> </span> </xsl:template> <xsl:template match="Description//Character"> <span class="character">
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<xsl:apply-templates /> </span> </xsl:template> <xsl:template match="Description//Actor"> <span class="actor"> <xsl:apply-templates /> </span> </xsl:template> <xsl:template match="Link"> <a href="{@href}"> <xsl:apply-templates /> </a> </xsl:template> <xsl:template match="Description//Program"> <span class="program"><xsl:apply-templates /></span> </xsl:template> <xsl:template match="Description//Series"> <span class="series"><xsl:apply-templates /></span> </xsl:template> <xsl:template match="Description//Channel"> <span class="channel"><xsl:apply-templates /></span> </xsl:template> </xsl:stylesheet> Using TVGuide10.xsl with TVGuide3.xml should give the same result as TVGuide9.xsl did.
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Whenever you have rules in a language, such as rules in CSS or templates in XSLT, you need some way to resolve conflicts when two of the rules apply to the same situation. What would happen, for example, if you had one template that matched all <Character> elements and another template that matched only those <Character> elements that had <CastMember> as their parent: <xsl:template match="Character"> <span class="character"><xsl:apply-templates /></span> </xsl:template> <xsl:template match="CastMember/Character"> <span class="character"><xsl:apply-templates select="Name" /></span> </xsl:template>
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CHAPTER 3 TEMPLATES
A <Character> element in a <Description> element only matches one of the templates, because it doesn t have a <CastMember> element as its parent, so obviously the XSLT processor uses that template with it. But what about a <Character> element in a <CastMember> element It matches both of the template s patterns, so what should the XSLT processor do
Template Priority
Well, the XSLT processor will only ever process one template when you apply templates to a node, so it has to choose between the two templates that it s presented with in some way. It does this by looking at the template s priority. A template with a high priority is chosen over a template with a lower priority. You can specifically assign a template a priority using the priority attribute on the <xsl:template> element. The priority attribute can be set to any number, including decimal and negative numbers. For example, you can give the two templates different specific priorities, as follows: <xsl:template match="Character" priority="-1"> <span class="character"><xsl:apply-templates /></span> </xsl:template> <xsl:template match="CastMember/Character" priority="2"> <span class="character"><xsl:apply-templates select="Name" /></span> </xsl:template>
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