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    <p><strong>One can often find examples of beautiful XSLT code, especially when XSLT is used as a functional programming language</strong>. </p> <p>For examples see <a href="http://www.idealliance.org/papers/extreme/proceedings/xslfo-pdf/2006/Novatchev01/EML2006Novatchev01.pdf" rel="nofollow noreferrer"><strong>this article</strong></a> on <a href="http://fxsl.sf.net" rel="nofollow noreferrer"><strong>FXSL 2.0</strong></a> -- the Functional Programming library for XSLT 2.0.</p> <p>As an FP language XSLT is also a <em><a href="http://en.wikipedia.org/wiki/Declarative_programming" rel="nofollow noreferrer"><strong>declarative language</strong></a></em>. This, among other things means that one declares, specifies existing relationships. </p> <p>Such <strong>a definition often does not need any additional code to produce a result -- it itself is its own implementation, or an executable definition or executable specification</strong>.</p> <p><strong>Here is a small example</strong>.</p> <p><strong>This XPath 2.0 expression defines</strong> the "<em>Maximum <a href="http://en.wikipedia.org/wiki/Prime_factor" rel="nofollow noreferrer">Prime Factor</a> of a natural number</em>":</p> <pre><code>if(f:isPrime($pNum)) then $pNum else for $vEnd in xs:integer(floor(f:sqrt($pNum, 0.1E0))), $vDiv1 in (2 to $vEnd)[$pNum mod . = 0][1], $vDiv2 in $pNum idiv $vDiv1 return max((f:maxPrimeFactor($vDiv1),f:maxPrimeFactor($vDiv2))) </code></pre> <p><strong>To pronounce it in English</strong>, the maximum prime factor of a number <strong><code>pNum</code></strong> is the number itself, if <strong><code>pNum</code></strong> is prime, otherwise if <strong><code>vDiv1</code></strong> and <strong><code>vDiv2</code></strong> are two factors of <strong><code>pNum</code></strong>, then the maximum prime factor of <strong><code>pNum</code></strong> is the bigger of the maximum prime factors of <strong><code>vDiv1</code></strong> and <strong><code>vDiv2</code></strong>.</p> <p><strong>How do we use this to actually calculate</strong> the Maximum Prime Factor in XSLT? <strong>We simply wrap up the definition above</strong> in an <code>&lt;xsl:function&gt;</code> and ... get the result!</p> <pre><code> &lt;xsl:function name="f:maxPrimeFactor" as="xs:integer"&gt; &lt;xsl:param name="pNum" as="xs:integer"/&gt; &lt;xsl:sequence select= "if(f:isPrime($pNum)) then $pNum else for $vEnd in xs:integer(floor(f:sqrt($pNum, 0.1E0))), $vDiv1 in (2 to $vEnd)[$pNum mod . = 0][1], $vDiv2 in $pNum idiv $vDiv1 return max((f:maxPrimeFactor($vDiv1),f:maxPrimeFactor($vDiv2))) "/&gt; &lt;/xsl:function&gt; </code></pre> <p><strong>We can, then, <a href="https://stackoverflow.com/questions/439814#445858">calculate the MPF for any natural number</a></strong>, for example:</p> <p><code>f:maxPrimeFactor(600851475143)</code> = 6857 </p> <p>As for efficiency, well, <strong>this transformation takes just 0.109 sec</strong>.</p> <p><strong>Other examples of both ellegant and efficient XSLT code</strong>:</p> <ul> <li><a href="http://www.tbray.org/ongoing/" rel="nofollow noreferrer"><strong>Tim Bray</strong></a>'s <a href="http://www.tbray.org/ongoing/When/200x/2007/09/20/Wide-Finder" rel="nofollow noreferrer"><strong>Wide Finder</strong></a>, as solved <a href="http://dnovatchev.spaces.live.com/Blog/cns!44B0A32C2CCF7488!385.entry" rel="nofollow noreferrer"><strong>here</strong></a>.</li> <li><a href="http://dnovatchev.spaces.live.com/blog/cns!44B0A32C2CCF7488!341.entry" rel="nofollow noreferrer"><strong>Cascade</strong></a> <a href="http://dnovatchev.spaces.live.com/blog/cns!44B0A32C2CCF7488!342.entry" rel="nofollow noreferrer"><strong>deletions</strong></a></li> <li><a href="http://dnovatchev.spaces.live.com/blog/cns!44B0A32C2CCF7488!384.entry" rel="nofollow noreferrer"><strong>Transitive closure</strong></a></li> <li><a href="http://dnovatchev.spaces.live.com/blog/cns!44B0A32C2CCF7488!357.entry" rel="nofollow noreferrer"><strong>Finding all anagrams</strong></a> of a word</li> <li><a href="http://fxsl.cvs.sourceforge.net/fxsl/fxsl-xslt2/Tests/testConcordance.xsl?revision=1.1&amp;view=markup" rel="nofollow noreferrer"><strong>Concordance</strong></a> of a text corpus (the Old Testament)</li> <li><a href="http://fxsl.cvs.sourceforge.net/fxsl/fxsl-xslt2/Tests/testFunc-spell.xsl?revision=1.2&amp;view=markup" rel="nofollow noreferrer"><strong>Spelling checking</strong></a> (Shakespear's Othello)</li> <li><a href="http://ajwelch.blogspot.com/2006/03/dimitres-tuned-sudoku-solution.html" rel="nofollow noreferrer"><strong>Sudoku solver</strong></a></li> <li>A general compiler-compiler system -- <a href="http://fxsl.cvs.sourceforge.net/viewvc/fxsl/fxsl-xslt2/f/func-lrParse.xsl?revision=1.7&amp;view=markup" rel="nofollow noreferrer"><strong>the LR-Parsing Framework of FXSL</strong></a>, used successfully for <a href="http://fxsl.cvs.sourceforge.net/viewvc/fxsl/fxsl-xslt2/f/func-json-document.xsl?revision=1.11&amp;view=markup" rel="nofollow noreferrer"><strong>a parser of JSON</strong></a> and XPath2.0.</li> </ul>
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    2. CO@Stimul8d: Yes, XSLT has become an elegant FP language.
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