barcodewriter zxing c# Summary You can replace an <xsl:for-each> element with a template holding its contents and an in Font

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Summary You can replace an <xsl:for-each> element with a template holding its contents and an
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<xsl:apply-templates> element selecting the nodes you want to process.
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Replacing <xsl:for-each> with Templates
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We ve still used <xsl:for-each> in a couple of other places within TVGuide4.xsl, so let s convert those instances in the same way as we ve done with the one that iterated over <Channel> elements. The next <xsl:for-each> is where we iterate over the <Program> elements, which is within the template that matches <Channel> elements. We can convert it by first replacing the <xsl:for-each> with an <xsl:apply-templates> element that has the same value for its select attribute: <xsl:template match="Channel"> <h2 class="channel"><xsl:value-of select="Name" /></h2> <xsl:apply-templates select="Program" /> </xsl:template> and then creating a template that matches <Program> elements. The new template has the same contents as the old <xsl:for-each> did: <xsl:template match="Program"> <div> <p> <span class="date"><xsl:value-of select="Start" /></span><br /> <span class="title"><xsl:value-of select="Series" /></span><br /> <xsl:value-of select="Description" /> <span onclick="toggle({Series}Cast);">[Cast]</span> </p> <div id="{Series}Cast" style="display: none;"> <ul class="castlist"> <xsl:for-each select="CastList/CastMember">
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CHAPTER 3 TEMPLATES
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<xsl:value-of select="Character" /> </span> <span class="actor"> <xsl:value-of select="Actor" /> </span> </li> </xsl:for-each> </ul> </div> </div> </xsl:template> This template also contains an <xsl:for-each>, one that iterates over the <CastMember> element children of <CastList> elements. Again, we can replace this <xsl:for-each> with an <xsl:apply-templates>: <xsl:template match="Program"> <div> <p> <span class="date"><xsl:value-of select="Start" /></span><br /> <span class="title"><xsl:value-of select="Series" /></span><br /> <xsl:value-of select="Description" /> <span onclick="toggle({Series}Cast);">[Cast]</span> </p> <div id="{Series}Cast" style="display: none;"> <ul class="castlist"> <xsl:apply-templates select="CastList/CastMember" /> </ul> </div> </div> </xsl:template> and create a separate template that deals with giving output for <CastMember> elements: <xsl:template match="CastMember"> <li> <span class="character"><xsl:value-of select="Character" /></span> <span class="actor"><xsl:value-of select="Actor" /></span> </li> </xsl:template> We now have four templates in TVGuide5.xsl, matching The document node <Channel> elements <Program> elements <CastMember> elements If you run TVGuide5.xsl with TVGuide.xml, you should get exactly the same result as the original, simplified stylesheet. Splitting up the processing into separate templates hasn t changed the result of the transformation.
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CHAPTER 3 TEMPLATES
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The Built-in Templates
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We ve seen that when you apply templates to a node, the XSLT processor tries to find the template that matches that node. But what happens when there isn t a template that matches a node For example, if we applied templates to the <Name> child of the <Channel> element, as follows, but didn t have a template to match the <Name> element: <xsl:template match="Channel"> <h2 class="channel"><xsl:apply-templates select="Name" /></h2> <xsl:apply-templates select="Program" /> </xsl:template> When the XSLT processor can t find a template to match the node that it s been told to process, it uses a built-in template. If you find that the result of your stylesheet includes text you didn t expect, chances are that it s due to the built-in templates. Just because there isn t a template for a particular node doesn t mean that the node s not processed. For elements, the built-in template is as follows: <xsl:template match="*"> <xsl:apply-templates /> </xsl:template> This template uses two bits of syntax that we haven t seen before: The match attribute of the template takes the value *. Templates with a match pattern of * match all elements. The <xsl:apply-templates> element doesn t have a select attribute. If you use <xsl:apply-templates> without a select attribute, the XSLT processor collects all the children of the current node (which is the node that the template matches) and applies templates to them. To see the effect of this, take another look at the part of the node tree containing the <Name> element, shown in Figure 3-6.
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element: Name text: BBC1
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Figure 3-6. The <Name> element and its text node child
The <Name> element has only one child node, a text node with the value BBC1. When you tell the XSLT processor to apply templates to the <Name> element, it will use the built-in template for elements, and hence apply templates to that text node. Now, again, we don t have a template that matches text nodes in our stylesheet, so the processor uses a built-in template. The built-in template for text nodes is <xsl:template match="text()"> <xsl:value-of select="." />
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