barcode generator github c# Summary Once a variable s value is set, it cannot be changed. But you can number nodes using the in Font

Encoder PDF 417 in Font Summary Once a variable s value is set, it cannot be changed. But you can number nodes using the

Summary Once a variable s value is set, it cannot be changed. But you can number nodes using the
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position() function, count nodes with the count() function, sum their values with the sum() function, average them with the avg() function, and get their minimum or maximum with the min() or max() functions.
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XSLT is a functional language. If you ve done a lot of procedural programming, you might find the transition to using XSLT a bit confusing because you need to change the way that you think about problems. But you can usually get the result that you re after fairly easily despite the fact that XSLT variables cannot be updated. In more complex cases, you may have to use recursive templates, which is something that we ll look at in 11.
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CHAPTER 6 VARIABLES AND PARAMETERS
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Counting the Number of Star Trek Episodes
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Let s try out counting nodes by providing a count of the number of Star Trek episodes found within TVGuide.xml, using a new version of our stylesheet, StarTrek6.xsl (based on StarTrek4.xsl). When we do find channels showing Star Trek episodes, we ll state how many Star Trek episodes are being shown. For example: There is 1 Star Trek episode showing this week. There are 2 Star Trek episodes showing this week. In the template for the <TVGuide> element, we can find all the Star Trek episodes, no matter what channel they re being shown on, with the following location path: Channel/Program[starts-with(Series, $series)] To count how many episodes there are, we can pass this node set of <Program> elements as the argument to the count() variable as follows: count(Channel/Program[starts-with(Series, $series)] Now we need to change the wording slightly depending on whether there s only one Star Trek episode or more than one Star Trek episode, which means using that count at least twice, so we ll store the count in a variable, $NumberOfStarTrekEpisodes: <xsl:variable name="NumberOfStarTrekEpisodes" as="xs:integer" select="count(Channel/Program[starts-with(Series, $series)])" /> We ll also create another variable, $Plural, which will be a Boolean true if the number of Star Trek episodes is more than one, false otherwise: <xsl:variable name="Plural" as="xs:boolean" select="$NumberOfStarTrekEpisodes > 1" /> Now we can create the sentence that we want using a combination of literal text, conditional statements, and <xsl:value-of> instructions. We can use the $Plural variable to judge whether we need are or is , and whether we need an s at the end of episodes : <p> There <xsl:choose> <xsl:when test="$Plural">are </xsl:when> <xsl:otherwise>is </xsl:otherwise> </xsl:choose> <xsl:value-of select="$NumberOfStarTrekEpisodes" /> Star Trek episode<xsl:if test="$Plural">s</xsl:if> showing this week. </p> Putting this all together in the template for the <TVGuide> element in StarTrek6.xsl, we get the following: <xsl:template match="TVGuide"> <xsl:variable name="StarTrekChannels"
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CHAPTER 6 VARIABLES AND PARAMETERS
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<p> <xsl:apply-templates select="$StarTrekChannels" mode="ChannelList" /> </p> <xsl:choose> <xsl:when test="$StarTrekChannels"> <xsl:variable name="NumberOfStarTrekEpisodes" as="xs:integer" select="count(Channel/Program[starts-with(Series, $series)])" /> <xsl:variable name="Plural" as="xs:boolean" select="$NumberOfStarTrekEpisodes > 1" /> <p> There <xsl:choose> <xsl:when test="$Plural">are </xsl:when> <xsl:otherwise>is </xsl:otherwise> </xsl:choose> <xsl:value-of select="$NumberOfStarTrekEpisodes" /> Star Trek episode<xsl:if test="$Plural">s</xsl:if> showing this week. </p> <xsl:apply-templates select="$StarTrekChannels" /> </xsl:when> <xsl:otherwise> <p>No Star Trek showing this week!</p> </xsl:otherwise> </xsl:choose> <p> <xsl:apply-templates select="$StarTrekChannels" mode="ChannelList" /> </p> </xsl:template> The result of transforming TVGuide.xml with StarTrek6.xsl is StarTrek6.html, which is shown in Figure 6-6.
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Figure 6-6. Viewing StarTrek6.html in Internet Explorer
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CHAPTER 6 VARIABLES AND PARAMETERS
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Sequence Constructors
So far we ve looked at how to use <xsl:variable> to define variables using the select attribute. There is another way to set the value of a variable: using its content. If you don t have a select attribute, the content of the <xsl:variable> element is used as a sequence constructor. The XSLT instructions that the <xsl:variable> element contains are used to create a sequence of nodes or atomic values (or a mixture of both), which are then assigned to the variable. Each instruction in a sequence constructor contributes zero or more items to the sequence that gets created by the sequence constructor. Most instructions don t actually create items for the sequence themselves, but rather determine which other instructions are used to create the items. For example, consider the following: <xsl:variable name="flagImage" as="element() "> <xsl:choose> <xsl:when test="@flag = 'favorite'"> <img src="favorite.gif" alt="[Favorite]" width="20" height="20" /> </xsl:when> <xsl:when test="@flag = 'interesting'"> <img src="interest.gif" alt="[Interest]" width="20" height="20" /> </xsl:when> </xsl:choose> </xsl:variable> The <xsl:choose> instruction (and the <xsl:when> elements that it contains) determines which set of instructions is used to construct the sequence: either the instructions held by the first <xsl:when> or the instructions held by the second <xsl:when>. Several other instructions play a similar role: <xsl:if> Determines whether or not the instructions that it contains are used, based on the value of its test attribute, to construct a result sequence. <xsl:for-each> Holds instructions that are repeated for each item in the sequence it selects with its select attribute, to construct a result sequence. <xsl:apply-templates> Applies templates to the items in the sequence it selects with its select attribute. The templates that are applied contain instructions that are used to construct a result sequence. Other instructions actually identify items that should be added to the result sequence. In the next few sections, we ll look at what you can do as a result.
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