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Moldes de XSl

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Os moldes de XSL

Os processadores de XSL analisam gramaticalmente a fonte de XML e tentam-na encontrar para fora a régua combinando do molde. Se a encontrar, as instruções dentro do molde combinando estão avaliadas então.



XML source

<?xml version="1.0"?>
<xslTutorial >

<bold>Hello, world.</bold>
<red>I am </red>
<italic>fine.</italic>
</xslTutorial>


HTML output 1
<P>
<B>Hello, world.</B></P>
<P style="color:red">I am </P>
<P>
<i>fine.</i></P>


XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="bold">
<P><B><xsl:value-of select="."/></B></P>
</xsl:template>
<xsl:template match="red">
<P style="color:red"><xsl:value-of select="."/></P>
</xsl:template>
<xsl:template match="italic">
<P><i><xsl:value-of select="."/></i></P>
</xsl:template>
</xsl:stylesheet>



Trajetos da posição

As partes do original de XML a que o molde deve ser aplicado são determinadas pelos trajetos da posição. Uma sintaxe requerida é especificada na especificação de XPath. Os casos simples olham similares a dirigir-se do filesystem. ver Stylesheet 1



XML source

<?xml version="1.0"?>
<xslTutorial >
<AAA id='a1' pos='start'>
<BBB id='b1'/>
<BBB id='b2'/>
</AAA>
<AAA id='a2'>
<BBB id='b3'/>
<BBB id='b4'/>
<CCC id='c1'>
<DDD id='d1'/>
</CCC>
<BBB id='b5'>
<CCC id='c2'/>
</BBB>
</AAA>
</xslTutorial>


HTML output 1

<DIV style="color:purple">BBB id=b1</DIV>
<DIV style="color:purple">BBB id=b2</DIV>
<DIV style="color:purple">BBB id=b3</DIV>
<DIV style="color:purple">BBB id=b4</DIV>
<DIV style="color:red">DDD id=d1</DIV>
<DIV style="color:purple">BBB id=b5</DIV>


XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="BBB">
<DIV style="color:purple">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</DIV>
</xsl:template>
<xsl:template match="/xslTutorial/AAA/CCC/DDD">
<DIV style="color:red">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</DIV>
</xsl:template>
</xsl:stylesheet>

Processar sempre começos com " do match= do molde/“. Este é um elemento da raiz e sua somente criança é o elemento do original, em nosso caso que é Tutorial de XSl. Muitos dos stylesheets não contêm este elemento explicitamente. Quando o molde explícito não existe implícito o molde, que contem a instrução está chamado. Isto significa: Processa todos os childrens do nó atual, including os nós do texto.




Wildcard

Um molde pode fazer o fósforo da seleção de trajetos de uma posição, trajetos individuais que estão sendo separados com “|”. (ver Stylesheet 1). O wildcard * seleciona todas as possibilidades. Comparar o Stylesheet 1 com o Stylesheet 2.



XML source

<?xml version="1.0"?>
<xslTutorial >
<employee>
<firstName>Joe</firstName>
<surname>Smith</surname>
</employee>
</xslTutorial>


HTML output 1

<DIV>[template: firstName outputs Joe ]</DIV>
<DIV>[template: surname outputs Smith ]</DIV>


XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="firstName|surname">
<DIV><xsl:text> [template: </xsl:text>
<xsl:value-of select="name()"/>
<xsl:text> outputs </xsl:text>
<xsl:apply-templates/ >
<xsl:text> ]</xsl:text> </DIV>
</xsl:template>
</xsl:stylesheet>


XSL stylesheet 2

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="*">
<DIV><xsl:text> [template: </xsl:text>
<xsl:value-of select="name()"/>
<xsl:text> outputs </xsl:text>
<xsl:apply-templates/ >
<xsl:text> ]</xsl:text> </DIV>
</xsl:template>
</xsl:stylesheet>



Modalidades de XSL

As modalidades em XSL permitem que o elemento seja processado por épocas múltiplas, cada vez produzindo o resultado diferente. No Stylesheet 2 uma das modalidades não existe.



XML source

<?xml version="1.0"?>
<xslTutorial >
<AAA id='a1' pos='start'>
<BBB id='b1'/>
<BBB id='b2'/>
</AAA>
<AAA id='a2'>
<BBB id='b3'/>
<BBB id='b4'/>
<CCC id='c1'>
<CCC id='c2'/>
</CCC>
<BBB id='b5'>
<CCC id='c3'/>
</BBB>
</AAA>
</xslTutorial>


HTML output 1

<DIV style="color:red">CCC id=c1</DIV>
<DIV style="color:red">CCC id=c2</DIV>
<DIV style="color:red">CCC id=c3</DIV>
<DIV style="color:blue">CCC id=c1</DIV>
<DIV style="color:blue">CCC id=c2</DIV>
<DIV style="color:blue">CCC id=c3</DIV>
<DIV style="color:purple">CCC id=c1</DIV>
<DIV style="color:purple">CCC id=c2</DIV>
<DIV style="color:purple">CCC id=c3</DIV>


XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<xsl:apply-templates select="//CCC" mode="red"/>
<xsl:apply-templates select="//CCC" mode="blue"/>
<xsl:apply-templates select="//CCC"/>
</xsl:template>
<xsl:template match="CCC" mode="red">
<DIV style="color:red">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</DIV>
</xsl:template>
<xsl:template match="CCC" mode="blue">
<DIV style="color:blue">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</DIV>
</xsl:template>
<xsl:template match="CCC">
<DIV style="color:purple">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</DIV>
</xsl:template>
</xsl:stylesheet>


XSL stylesheet 2

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<xsl:apply-templates select="//CCC" mode="red"/>
<xsl:apply-templates select="//CCC" mode="yellow"/>
</xsl:template>
<xsl:template match="CCC" mode="red">
<DIV style="color:red">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</DIV>
</xsl:template>
<xsl:template match="CCC">
<DIV style="color:purple">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</DIV>
</xsl:template>
</xsl:stylesheet>



A prioridade do molde

Muito frequentemente diversos dos moldes combinam o elemento selecionado na fonte de XML. Deve-se conseqüentemente decidir-se que a se usar. Os moldes são requisitados de acordo com sua prioridade que pode ser especificada com o attributte da prioridade. Se um molde não contiver este atributo, sua prioridade está calculada de acordo com diversas réguas.






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