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CHAPTER 10 IDS, KEYS, AND NUMBERING
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should be accessible quickly by key values; these values can be in any format and can come from anywhere. Keys also have the advantage of not making the stylesheet dependent on a DTD or schema being specified for the source XML document, which means that you can rely on the stylesheet having access to the elements through the key in a way that you can t with an ID. Keys also support many-to-many mappings where the same key value can be used to access many elements and the same element can be accessed with many key values. We ve also introduced <xsl:number> in this chapter as a method of generating and formatting numbers. The <xsl:number> instruction is arguably less useful in the data-oriented XML that we re primarily working with here than it is in document-oriented XML, where you often need to number lists, footnotes, and sections. However, numbering can sometimes come in handy, especially when you re generating IDs for items that will remain the same over transformations (unlike those generated with the generate-id() function). You ve seen how <xsl:number> can be used for three different kinds of numbering: singlelevel simple lists, numbering items across entire documents or within particular sections, and generating multilevel numbers for hierarchical structures. The format attribute controls how these numbers are displayed, allowing you to create numbers from many different numbering schemes. Again, the format attribute and the other attributes that control the presentation of the numbers that you generate are all attribute value templates, which means that they can all be set dynamically based on parameters passed into the stylesheet or the individual template. We ve also touched on a couple of other methods of numbering, which you can use to generate numbers even if you still use <xsl:number> to format them, namely using position() and counting the preceding siblings of the node that you re interested in. The <xsl:number> instruction tends to be quite inefficient when it comes to generating numbers, and it always gives you numbers based on the source tree, so it s often better to use the position() function to create numbers if you can.
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1. What is the advantage of using ID attributes and the id() function over using predicates to search for elements 2. What format can the values of ID attributes take 3. Create a DTD in which the required custNo attribute of the <Customer> element is an ID attribute. 4. What three types of arguments can the id() function take and what does it return from each 5. What advantages are there for using keys rather than IDs 6. In what situations might you use the keys defined as follows <xsl:key name="films" match="Film" use="@id" /> <xsl:key name="filmsByCharacters" match="Film" use="CastList/CastMember/Character/Name" /> <xsl:key name="filmsByYear" match="Film" use="Year" /> <xsl:key name="filmsByDirector" match="Film" use="Director/Name" /> <xsl:key name="filmsByYearAndDirector" match="Film"
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CHAPTER 10 IDS, KEYS, AND NUMBERING
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7. What two ways can you use to generate a number giving the position of a node within the source tree 8. What s the biggest difference between using position() and using <xsl:number> to number items 9. What does the following piece of code generate <xsl:for-each select="Program"> <xsl:variable name="format"> <xsl:choose> <xsl:when test="position() mod 3 = 1">{1}</xsl:when> <xsl:when test="position() mod 3 = 2">[A]</xsl:when> <xsl:otherwise>(i)</xsl:when> </xsl:choose> </xsl:variable> <xsl:number format="{$format}" /> ... </xsl:for-each> 10. What different values can the level attribute on <xsl:number> take and how does its value change the numbering of a node
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Named Templates, Stylesheet Functions, and Recursion
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revious chapters have introduced you to the concept of templates: blocks of code that break up a stylesheet to make it more manageable and more reusable. So far, we ve only looked at matching templates, which are invoked when you apply templates to a particular type of node. In this chapter, we ll look at named templates, which are templates that you invoke by calling them by name. We ll also introduce stylesheet functions. Like named templates, stylesheet functions are reusable blocks of code that are invoked by name, but whereas named templates are called using an instruction (<xsl:call-template>) within a sequence constructor, stylesheet functions are called using a standard function call from within an XPath expression or a pattern. Named templates and stylesheet functions are very powerful: they enable you to use XSLT to perform just about every computation you might want to, making XSLT a true programming language. But as we ve already seen, XSLT is different from most programming languages. In procedural programming languages, you can use iteration to perform calculations: you can initialize a variable and update it each time you loop. XSLT, on the other hand, is a functional programming language, which means that the same instruction in the same context will always produce the same thing, no matter how many times it s run. XSLT doesn t have while loops, for example, because a variable s value can t change (if it did, the number of times you assigned a new value to a variable would determine what value the variable took). Therefore, when you re programming with XSLT, you need to use recursion to give the same effect as you would get from while loops in procedural languages. In this chapter, you ll learn how to construct recursive templates and functions to carry out common tasks. In this chapter, you ll learn How to create and call a named template How to create and call a stylesheet function The principles of recursion How to write a recursive template or function Recursing with numbers, strings, and sequences
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