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Like other functions, stylesheet functions can be called from within an XPath expression using the syntax functionName(arguments), which is shorter than the equivalent <xsl:call-template> instruction and can be used in places where an <xsl:call-template> instruction can t, such as in a predicate Stylesheet functions can be useful just as a replacement for long XPath expressions, especially if the same expression is used in several places For example, we might want to replace this test: <xsl:if test="@flag = ('favorite', 'interesting') or @rating > 6 or (some $n in (Series, Title, Description) satisfies contains(lower-case($n), 'news'))"> .. </xsl:if> with a call to a function called something like is-interesting-program() This would make it more apparent that the code was testing whether the program is interesting or not Another way in which stylesheet functions are sometimes useful is that they can wrap around XSLT code to make it callable from an XPath expression.

single call to a function provided by the OpenGL library: glReadPixels().2 Before doing so, however, you need to make a decision on which channels interest you and tell the OpenGL library how you want it to convert the pixels into values. Before discussing the particulars, let s look at a subroutine that can be used to capture any part of the currently displayed window to an image file. We use the Image::Magick module to translate the raw information that comes from the call to glReadPixels(), and to save the file to disk.

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There are some things that you can do with XSLT code that you can t do within an XPath expression For example, the following XSLT elements offer functionality that isn t otherwise available in XPath: The <xsl:variable> element enables you to hold values in variables to simplify your code; the only variables supported in XPath are range variables, which can t hold sequences The <xsl:perform-sort> instruction enables you to sort sequences, and in particular do sorts based on calculated values The <xsl:for-each-group> instruction enables you to create sequences of distinct items based on calculated values (such as the number of children a node has) The <xsl:analyze-string> instruction enables you to do much more complex string manipulation than that supported by the functions available in XPath.

Stylesheet functions can help if you want to do any of these things in a context where it s difficult or impossible to use XSLT code directly, such as within the match pattern of a template Finally, stylesheet functions can simply be used instead of templates, depending on your coding style It s a good idea to take advantage of templates with different match patterns if you need to generate different results for different nodes, so if the result of a block of code depended on the type or kind of a node, then I d use templates one for each different kind of node.

use OpenGL qw(:all); use Image::Magick; sub gltIMCapture { my $file = shift; my $rgba; my ($x, $y, $width, $height) = @_ == 4 @_ : glGetIntegerv_p(GL_VIEWPORT); glFinish(); glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT); glPixelStorei(GL_PACK_ROW_LENGTH, $width); glPixelStorei(GL_PACK_ALIGNMENT, 1); glReadPixels_s($x, $y, $width, $height, GL_RGBA, GL_UNSIGNED_BYTE, $rgba); glPopClientAttrib(); my $im = Image::Magick->new( size => "${width}x$height", magick => 'RGBA'); my $rc = $im->BlobToImage($rgba); warn($rc), return if $rc; $im->Write($file) if $file; return $im; }

Otherwise, I d usually use a template if the result included newly generated nodes (as in the link template that we looked at in the last section) and a function if the result was a sequence of atomic values or existing nodes (such as for the is-interesting-program() function, which would return a Boolean value) Now that we ve seen why stylesheet functions might be useful, we ll turn to looking at how to declare them..

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