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Le mascherine di XSL
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I processor di XSL analizza la fonte di XML e prova a scoprire la regola di corrispondenza della mascherina. Se la trova, allora le istruzioni all'interno della mascherina di corrispondenza � valutata.
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XML source
<?xml version="1.0"?>
<xslTutorial >
<bold>Hello, world.</bold>
<red>I am </red>
<italic>fine.</italic>
</xslTutorial>
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HTML output 1
<P>
<B>Hello, world.</B></P>
<P style="color:red">I am </P>
<P>
<i>fine.</i></P>
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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>
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| Percorsi di posizione
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Le parti del documento di XML a cui la mascherina dovrebbe essere applicata sono determinate dai percorsi di posizione. Una sintassi richiesta � specificata nella specifica di XPath. I casi semplici sembrano simili al richiamo del filesystem. vedere Stylesheet 1
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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>
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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>
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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>
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L'elaborazione sempre inizio con "/�del match= della mascherina. Ci� � un elemento della radice ed il relativo soltanto bambino � l'elemento del documento, nel nostro caso che � lezione privata di XSl. Molti degli stylesheets non contengono questo elemento esplicitamente. Quando la mascherina esplicita non esiste implicito la mascherina, che contiene l'istruzione � denominata. Ci� significa: Procede tutti i childrens del nodo corrente, compreso i nodi del testo.
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| Metacarattere
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Una mascherina pu� fare il fiammifero dalla selezione dei percorsi di posizione, diversi percorsi che sono separati con �|�. (vedere Stylesheet 1). Il metacarattere * seleziona tutte le possibilit�. Paragonare lo Stylesheet 1 allo Stylesheet 2.
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XML source
<?xml version="1.0"?>
<xslTutorial >
<employee>
<firstName>Joe</firstName>
<surname>Smith</surname>
</employee>
</xslTutorial>
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HTML output 1
<DIV>[template: firstName outputs Joe ]</DIV>
<DIV>[template: surname outputs Smith ]</DIV>
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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>
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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>
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| XSL Modes
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I modi in XSL permettono che l'elemento sia proceduto per i periodi multipli, ogni volta fornendo il risultato differente. Nello Stylesheet 2 uno dei modi non esiste.
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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>
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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>
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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>
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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>
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| The Template Priority
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Varie delle mascherine abbinano molto spesso l'elemento selezionato nella fonte di XML. Dovrebbe quindi essere deciso quale da usare. Le mascherine sono ordinate secondo la loro priorit� che pu� essere specificata con il attributte di priorit�. Se una mascherina non contiene questo attributo, la relativa priorit� � calcolata secondo parecchie regole.
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