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Sending Messages to the User
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Of course you might want the processing to stop if the processor doesn t support XSLT 2.0 the fact that it doesn t might mean that the stylesheet simply can t be used with that particular processor. In that case, you can use <xsl:message> to stop the process. The <xsl:message> element sends a message to the user. The way the message is presented depends on the processor you use and the way in which you call the processor, but usually if you use a command-line processor, you ll see the message appear on the command line, and if you use a processor embedded in a browser, you won t see the message at all. The message that s sent to the user usually goes in the content of the <xsl:message> element. You can put anything you like in there, including literal result elements and XSLT instructions, so you re not just limited to textual messages. If you want processing to stop under a particular condition, such as when the stylesheet is called with an XSLT 1.0 processor, then you should set the terminate attribute to yes. The content of the <xsl:message> can give a more user-friendly error than the one the processor is likely to give on its own. For example, the following template matches the root node and generates an error if the processor used with the stylesheet isn t an XSLT 2.0 processor or above: <xsl:template match="/"> <xsl:if test="number(system-property('xsl:version')) < 2.0"> <xsl:message terminate="yes"> <xsl:text>This stylesheet requires an XSLT 2.0 processor.</xsl:text> </xsl:message> </xsl:if> <html> ... </html> </xsl:template> The <xsl:message> element can also be useful for debugging, or simply sending messages to the user to report on progress, especially if the stylesheet takes a long time to run. In these cases, you don t want the transformation to stop, so you should omit the terminate attribute or give it the value "no".
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Note As we ll see in the next section, the error() and trace() functions are alternative methods of
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T 2.0 processors.
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CHAPTER 14 BACKWARDS COMPATIBILITY AND EXTENSIONS
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If you know that the processor is an XSLT 2.0 processor, you can use the select attribute rather than the content of the <xsl:message> element to provide the content of the message. However, this attribute wasn t allowed in XSLT 1.0, so there s no point using it if the message is intended for XSLT 1.0 processors.
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Summary The <xsl:message> element sends a message to the user. If the terminate attribute is set
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to yes, the transformation halts.
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Same-Version Compatibility
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The previous section focused on providing alternative code for XSLT 1.0 and XSLT 2.0 processors. The techniques outlined there can also be used to provide alternative code for XSLT 2.0 processors that need to run stylesheets in a future version of XSLT, because if a stylesheet is labeled as using version 3.0 (say), an XSLT 2.0 processor will operate in forwards-compatible mode and ignore any unknown functions or instructions as long as it doesn t have to execute them. But if you run an XSLT 2.0 stylesheet with an XSLT 2.0 processor that is incomplete, or run a Schema-Aware XSLT 2.0 stylesheet with a Basic XSLT 2.0 processor, the processor won t operate in forwards-compatible mode. In this case, the processor will report an error if you use a function or instruction that it doesn t support (even if that function or instruction is in the spec), or use syntax that relies on schema-awareness (such as the schema-element() node test). In this section, we ll look at how you can test the capabilities of your XSLT 2.0 processor and provide alternative code when it doesn t support particular parts of XSLT 2.0.
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Testing Function Availability
As we ve seen, XSLT 1.0 and XSLT 2.0 processors support different sets of functions, and XSLT processors that haven t yet reached full XSLT 2.0 compliance might only support a subset of the functions that they re supposed to. What s more, implementations can add support for their own extension functions, going beyond those specified in the standard languages. So how do you work out whether the processor that s being used to run the stylesheet supports the function that you want to use Well, you can use the function-available() function to find out. The function-available() function takes the name of a function as an argument and returns true if the processor supports the function and false if the processor doesn t support the function. So, for example, you could work out whether the processor that s being used with the stylesheet supports the avg() function with function-available('avg')
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