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CHAPTER 14 BACKWARDS COMPATIBILITY AND EXTENSIONS
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Providing an alternative to an instruction within a nested <xsl:fallback> element Using the use-when attribute to use alternative XSLT for different processors Providing an alternative implementation of an extension function using an <xsl:function> element with an override attribute with the value yes We ve also looked at three ways of letting the user know what s happening by providing more user-friendly error messages or simply supplying arbitrary information, which is particularly useful when debugging: Issuing a message with <xsl:message>, and either halting the process or carrying on Halting the transformation with an error using the error() function Reporting the value of an XPath expression using the trace() function This chapter is the last of the ones covering the details of XSLT. You ve learned about pretty much all the elements and attributes that are available in XSLT, and the functions and operators that are available in XPath, and in this chapter you ve learned how to add to what XSLT and XPath offer as standard. In the next chapters, we ll turn our attention to some practical uses of XSLT and XPath so that you can see how it all fits together in the real world.
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Review Questions
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1. What kinds of changes do you need to make when upgrading an XSLT 1.0 stylesheet to XSLT 2.0 2. Write some portable XSLT that identifies the highest-rated program within the TV guide. You can do this using the max() function in XSLT 2.0, if it s supported by the XSLT 2.0 processor; the math:max() extension function, if it s supported by the XSLT processor; a stylesheet function, if it s supported by the XSLT 2.0 processor; and otherwise have to use a recursive template. Use appropriate techniques to work out which method the XSLT processor can use and provide alternative code or messages to the user. 3. Which extension attributes does your XSLT processor support and what do they do 4. How does an XSLT processor tell the difference between a literal result element and an extension instruction 5. What two ways are there of detecting when an XSLT processor doesn t support an extension instruction, and when is it appropriate to use them
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CHAPTER
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o far, we have been transforming XML in a batch process from the command line. Using a command-line processor is very useful when first developing a stylesheet for several reasons. First, it tends to be easier and quicker to debug stylesheets when using a processor from the command line rather than using it in a more dynamic environment. Second, there are lots of processors that you can use from the command line, so you can often work out what s going wrong by trying to use several different ones on the same transformation. Third, command lines often give you access to additional information about the performance of the stylesheet, such as timing information or trace reports that you can use to perfect the stylesheet. However, batch processing is seldom the best approach in real-world systems. The result of a transformation can change for several reasons amendments to the stylesheet, changes to the source document (perhaps because it is itself generated dynamically), alterations to the supplementary documents that you re using, and so on and with batch processing you need to run the transformation each time one of these documents changes. This can easily lead to the transformed documents being out of step with the original documents. If you can use a dynamic process to perform the transformation and display the results, then you don t have to worry about the source document changing later on any changes will be automatically reflected in the newly transformed result. In this chapter, we ll look at how to carry out transformations dynamically and at two applications that support dynamic XSLT. In this chapter, you ll learn How to run dynamic transformations The advantages and disadvantages of client-side and server-side transformations How to set up and use Cocoon 2 How to manage client-side transformations using Sarissa How to pass parameters to create dynamic applications
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