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Generator PDF-417 2d barcode in Font NAMED TEMPLATES, STYLESHEET FUNCTIONS, AND RECURSION

CHAPTER 11 NAMED TEMPLATES, STYLESHEET FUNCTIONS, AND RECURSION
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There s only one recursive call within this function (the one that s highlighted) and it occurs as the last thing within an if expression in a <xsl:sequence> that is the last instruction in the function. If the recursive call happens at all, then it s the last thing that happens. Now consider the following definition of the function, which performs the same calculation, but this time by getting the product of the rest of the items, and then multiplying that by the value of the first item: <xsl:function name="private-math:product" as="xs:double"> <xsl:param name="numbers" as="xs:double*" /> <xsl:sequence select="if (exists($numbers)) then $numbers[1] * private-math:product($numbers[position() > 1]) else 1" /> </xsl:function> In this version, there s still only one recursive call to the private-math:product() function, but it is not the last thing that happens when the function is processed. After getting the product of the rest of the numbers, the template goes on to use that product to work out what value to give as the result (by multiplying it by the first number in the sequence). So the preceding template is not tail recursive.
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Summary A tail recursive template is a template that only calls itself once, as the last thing it does during
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its instantiation.
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This chapter has introduced you to named templates and stylesheet functions as a way of splitting up a stylesheet to make it more manageable, and to perform calculations that require recursion. You can name any template (including those that match nodes) using the name attribute on <xsl:template>. Every template s name must be different, so that the processor can identify it when you call it with the <xsl:call-template> instruction. Like normal templates, you can pass parameters into named templates with <xsl:with-param> elements within <xsl:call-template>. You can declare the type of the result of a template using the as attribute on the <xsl:template> element. You can define a stylesheet function using the <xsl:function> element, which is very similar in structure to a template. Parameters are passed to functions by position rather than by name, so all function parameters are therefore required (and none can have a default value). You can define two functions with the same name and different numbers of parameters in order to support functions with optional arguments. Also, unlike templates, the function body is always evaluated without a context item, so you need to pass any information that you want to use in the function via arguments, explicitly. XSLT and XPath 2.0 have a lot more support for sequences than XSLT 1.0 did, in particular because they allow sequences of atomic values. XSLT supports iteration over a sequence with <xsl:for-each> and <xsl:apply-templates>, and you can iterate over a sequence in XPath with for, some, and every expressions. XPath supports counters with the position() function and has several aggregating functions such as count(), sum(), min() and string-join(). However, .
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CHAPTER 11 NAMED TEMPLATES, STYLESHEET FUNCTIONS, AND RECURSION
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Recursive templates and functions call themselves, and you should design them so that they re tail recursive, as this allows processors to execute them without assigning lots of unnecessary resources to them. A tail-recursive template or function calls itself once only, and it s the last thing that it does during a single instantiation of the template or function. We ve seen how to use recursive templates and functions to perform numeric calculations and to split up a string into characters. There are many different ways of using XSLT. At the beginning of this book, you learned how to use XSLT as a designer creating a template of a page and then populating it with information from an XML document. In the previous several chapters, you ve become an XSLT author, which has enabled you to create more sophisticated pages. Now, knowing how to design and use recursive templates and functions, you are on your way to becoming an XSLT programmer, someone who can use XSLT to perform just about any task that involves manipulating XML.
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