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Encoding PDF417 in Font NAMED TEMPLATES, STYLESHEET FUNCTIONS, AND RECURSION

CHAPTER 11 NAMED TEMPLATES, STYLESHEET FUNCTIONS, AND RECURSION
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Thus far, the templates that you ve been writing have all matched a particular node and done something with it. Some of these templates have been templates with modes, which enable you to get a different result from the same node, and some of them have used parameters to pass in extra information about how the node should be processed. These templates are the main component of your stylesheets because the main goal of XSLT is to process nodes from a source node tree. Splitting up your stylesheet into templates actually helps you in two ways. First, it allows you to use the processor s node-matching capabilities to work out what piece of code to use to process a particular node. This is particularly useful when you re processing documentoriented XML or XML whose structure might evolve over time. Second, it enables you to break up a stylesheet into reusable portions. This cuts down on the length of the stylesheet (because you don t have to repeat the same code in different places) and makes it easier to author and maintain (because it helps you focus on a particular bit of code at a time). We ve used both these aspects of templates in previous chapters, taking advantage of the latter feature when we apply templates to a node in a particular mode to process that node in a particular way. However, some pieces of processing aren t dependent on what node you re processing, or might need to be carried out when there is no node available on which to hang the process. For example, say that we wanted to provide different images according to the value of the flag attribute on the <Program> element. We can use a template that matches the flag attribute to provide the image, as follows: <xsl:template match="@flag"> <img src="{if (. = 'favorite') then 'favorite' else 'interest'}.gif" alt="[{if (. = 'favorite') then 'Favorite' else 'Interest'}]" width="20" height="20" /> </xsl:template> But say that we want to provide a spacer image if the flag attribute is missing. There s no flag attribute node to match on in this case, so the code has to be embedded in the template for the <Program> element instead: <xsl:template match="Program" mode="Details"> ... <img src="{if (@flag) then (if (@flag = 'favorite') then 'favorite' else 'interest') else 'spacer'}.gif" alt="[{if (@flag) then (if (@flag = 'favorite') then 'Favorite' else 'Interest') else ' '}]" width="20" height="20" /> ... </xsl:template> While there s nothing wrong with that in terms of the functionality of the code, it does use seven lines in the template processing the <Program> element, rather than one line applying the template to the flag attribute, and these seven lines would have to be repeated if the same code were required elsewhere.
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CHAPTER 11 NAMED TEMPLATES, STYLESHEET FUNCTIONS, AND RECURSION
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What s required in such situations is a way to create a template and call it without applying templates to a particular node. You can do this in XSLT using named templates. Every template can be assigned a name with its name attribute (including those templates that are already matching templates). Each must have its own distinct name, though it can be the same as the name of a mode. Named templates can take parameters, just like any other template, and indeed since they have no other source of information about what they re supposed to do, it s a rare named template that doesn t have any. In this example, a template named image could take a $flag parameter, as follows: <xsl:template name="image"> <xsl:param name="flag" as="xs:string" required="yes" /> <img src="{if ($flag) then (if ($flag = 'favorite') then 'favorite' else 'interest') else 'spacer'}.gif" alt="[{if ($flag) then (if ($flag = 'favorite') then 'Favorite' else 'Interest') else ' '}]" width="20" height="20" /> </xsl:template>
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