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Os machados de XSL
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Os machados jogam o papel muito importante em XSL. Todos os machados são usados no exemplo dado abaixo
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XML source
<?xml version="1.0"?>
<xslTutorial >
<doc>
<ancprec>
<p>Preceeding Ancestor. <br/></p>
</ancprec>
<gf>
<p>Ancestor. <br/></p>
<pprec choice="a">
<p>Preceeding Parent.<br/> </p>
</pprec>
<par>
<p>Parent. <br/></p>
<sibprec>
<p>Preceeding sibling.<br/> </p>
</sibprec>
<me id="id001">
<p>Me.<br/> </p>
<!-- Comment after Me -->
<chprec >
<p>Preceeding child.<br/> </p >
</chprec>
<child idref="id001">
<p>Child. <br/></p>
<?pi Processing Instruction ?>
<dprec>
<p>preceeding Descendant.<br/> </p>
</dprec>
<desc>
<p>Descendant.<br/> </p>
</desc>
<dfoll>
<p>Following Descendant.<br/> </p>
</dfoll>
</child>
<chfoll>
<p>following child.<br/> </p>
</chfoll>
</me>
<sibfoll>
<p>Following Sibling.<br/> </p>
</sibfoll>
</par>
<pfoll>
<p>Following Parent.<br/> </p>
</pfoll>
</gf>
<ancfoll>
<p>following Ancestor.<br/></p>
</ancfoll>
</doc>
</xslTutorial>
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HTML output 1
<HTML>
<HEAD> </HEAD>
<BODY>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Document</title> </head>
<body>
<H2>Following Axis</H2>
<b>Following Sibling.
<br> Following Parent.
<br> following Ancestor.
<br> </b>
<H2>Descendant or Self Axis</H2>
<b>Me.
<br> Preceeding child.
<br> Child.
<br>preceeding Descendant.
<br> Descendant.
<br> Following Descendant.
<br> following child.
<br> </b>
<H2>Descendant Axis</H2>
<b>Preceeding child.
<br> Child.
<br>preceeding Descendant.
<br> Descendant.
<br> Following Descendant.
<br> following child.
<br> </b>
<H2>Self Axis</H2>
<b>Me.
<br> </b>
<H2>Child Axis</H2>
<b>Preceeding child.
<br> Child.
<br>following child.
<br> </b>
<H2>Following Axis</H2>
<p>
<b>Following Sibling.
<br> Following Parent.
<br> following Ancestor.
<br> </b>
<br>
<i>Note the lack of ancestors here?
<br>Learned anything about document order yet?</i> </p>
<H2>Following Sibling Axis</H2>
<b> Following Sibling.
<br> </b>
<H2>Attribute Axis</H2>
<b>id001</b>
<H2>Parent Axis</H2>
<b>Parent.
<br> </b>
<H2>Ancestor or Self Axis</H2>
<b>Ancestor.
<br>Parent.
<br>Me.
<br> </b>
<H2>Ancestor Axis</H2>
<b>Ancestor.
<br>Parent.
<br> </b>
<H2>Preceding Sibling Axis</H2>
<b>Preceeding sibling.
<br> </b>
<H2>Preceeding Axis</H2>
<b>
<i>Not Implemented in XT 22 09 99</i></b>
<H2>Namespace Axis</H2>
<b>
<i>Not Implemented in XT 22 09 99</i></b>
</body>
</html>
</BODY>
</HTML>
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XSL stylesheet 1
<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' >
<xsl:template match="/">
<!-- Lesson. Note how the initial context node
is reduced by the apply templates; this stops
the 'leaking' of content when all I want is
a subset of the whole in the result tree -->
<xsl:apply-templates select="//me"/>
</xsl:template>
<xsl:template match="br">
<br />
</xsl:template>
<xsl:template match="me" priority="10">
<html>
<head>
<title> <xsl:text> Document</xsl:text> </title>
</head>
<body>
<H2>Following Axis</H2>
<b><xsl:apply-templates select="following::*/p"/></b>
<H2>Descendant or Self Axis</H2>
<b><xsl:apply-templates select="descendant-or-self::*/p"/></b>
<H2>Descendant Axis</H2>
<b><xsl:apply-templates select="descendant::*/p"/></b>
<H2>Self Axis</H2>
<b><xsl:apply-templates select="self::*/p"/></b>
<H2>Child Axis</H2>
<b><xsl:apply-templates select="child::*/p"/></b>
<H2>Following Axis</H2>
<p><b><xsl:apply-templates select="following::*/p"/></b>
<br /><i>Note the lack of ancestors here? <br />Learned anything
about document order yet?</i></p>
<H2>Following Sibling Axis</H2>
<b><xsl:apply-templates select="following-sibling::*"/></b>
<H2>Attribute Axis</H2>
<b>
<H2>Parent Axis</H2>
<b><xsl:apply-templates select="parent::*/p"/></b>
<H2>Ancestor or Self Axis</H2>
<b><xsl:apply-templates select="ancestor-or-self::*/p"/></b>
<H2>Ancestor Axis</H2>
<b><xsl:apply-templates select="ancestor::*/p"/></b>
<H2>Preceding Sibling Axis</H2>
<b><xsl:apply-templates select="preceding-sibling::*/p"/></b>
<H2>Preceeding Axis</H2>
<b><i>Not Implemented in XT 22 09 99</i></b>
<H2>Namespace Axis</H2>
<b><i>Not Implemented in XT 22 09 99</i></b>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
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A linha central da criança:: pode ser seja omitido da etapa da posição porque é uma linha central do defeito. O atributo da linha central:: pode ser o abbreviatet ao @. // é um short para /descendant-or-self:: . é o short para o self:: e. é o short para o pai::.
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