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If an extension function does something that can be done using XSLT, you may want to provide an alternative implementation as a stylesheet function, so that XSLT processors that don t support the particular extension function you re using can still execute the stylesheet. As we saw in 11, you can create a stylesheet function using the <xsl:function> top-level element. If the name that you specify for a stylesheet function is the same as the name of an extension function that is supported by the XSLT processor that you re using, then the XSLT processor looks at the override attribute to work out what to do. If the override attribute is missing, or if it has the value yes, then the XSLT implementation of the function, as specified by the <xsl:function> element, will be used instead of the built-in extension function. This is useful if you want to guarantee that all XSLT processors will use exactly the same code to perform a function. If the override attribute has the value no, on the other hand, then the implementation that you ve provided using the stylesheet function will only be used if the XSLT processor doesn t provide an implementation of the function itself. For example, we could define the math:sqrt() function using the code from 11, and specify override="no" as follows: <xsl:function name="math:sqrt" as="xs:double" override="no"> <xsl:param name="number" as="xs:double" /> <xsl:sequence select="private-math:squareRoot($number, 4, 1)" /> </xsl:function>

<xsl:function name="private-math:squareRoot" as="xs:double"> <xsl:param name="number" as="xs:double" /> <xsl:param name="precision" as="xs:integer" /> <xsl:param name="estimate" as="xs:double" /> <xsl:variable name="nextEstimate" as="xs:double" select="$estimate + (($number - $estimate * $estimate) div (2 * $estimate))" /> <xsl:variable name="roundedEstimate" as="xs:double" select="round-half-to-even($nextEstimate, $precision) " /> <xsl:sequence select="if ($estimate = $roundedEstimate) then $estimate else private-math:squareRoot($number, $precision, $roundedEstimate)" /> </xsl:function> Doing this means that XSLT processors that have built-in support for the math:sqrt() function will use that built-in support, while those that don t will use the preceding stylesheet implementation. Any built-in support for the math:sqrt() function is likely to be more efficient and will undoubtedly be more precise (in the preceding implementation, the result is only reported to four decimal places), so this definition takes advantage of the capabilities of the XSLT processors that support the math:sqrt() function while retaining portability to different XSLT processors.

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Although this chapter has been dedicated to Blender, you can check out other Free Software 3D tools, including the following: K-3D (GNU/Linux, Windows, Mac): A 3D modeling and animation package that features a procedural engine. www.k-3d.org. Aqsis (GNU/Linux, Windows, Mac): A 3D rendering system compatible with Pixar s RenderMan standard. www.aqsis.org.

Summary You can use the override attribute of the <xsl:function> element to tell an XSLT processor

to use the built-in implementation of an extension function rather than a stylesheet function of the same name.

As well as XPath, implementers also have a fair degree of control over the functionality of XSLT. The first set of extensions that an implementer can make is to define the set of acceptable values of certain attributes in XSLT instructions. There are two examples of this which we will look at briefly: The method attribute of <xsl:output> The collation attribute of <xsl:sort>, <xsl:for-each-group>, and <xsl:key>

Wings 3D (GNU/Linux, Windows, Mac): A 3D modeler, rather than an animation package. www.wings3d.com. YafaRay (GNU/Linux, Windows, Mac): A raytracing rendering system that can be used with Blender. www.yafaray.org.

helpful to you. One thing to be aware of is that BlackBerry addiction is a slippery slope; you may say Yes to only a few questions today, but it s quite possible that the number will grow substantially in a few weeks. The longer you use your device, the more likely your list is to grow.

Note The data-type attribute of <xsl:sort> also allows an implementer to change how a sort is done,

As you ll remember from 8, the method attribute of <xsl:output> determines the serialization method that s used when the result tree is output by the stylesheet to file or to another

All of these packages are available in Ubuntu using the Add/Remove Programs application. YafaRay is a rewrite of an earlier program called YafRay, so you may find Ubuntu packages under the old name.

application XSLT defines four specific values that are allowed for the method attribute of <xsl:output> html, xhtml, xml, and text but allows a processor to accept other values, as long as they are qualified names with a prefix The output method that you use controls things like the following: The syntax for elements, especially empty elements Which characters are represented as entity references, if any, and how Whether extra information is added to indicate the encoding of the document How Boolean attributes are output What defaults are used for other attributes on <xsl:output> The HTML output method in particular does a lot behind the scenes because the processor is aware of some of the semantics of HTML elements and attributes, for example: The href attribute on the <a> element is a URI, and non-ASCII characters within it should therefore be escaped.

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