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CHAPTER 7 PATHS AND SEQUENCES
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Figure 7-19. Viewing TVGuide8.html in Internet Explorer
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Paths create sequences of nodes, but XPath 2.0 supports other kinds of sequences as well. The items in a sequence can be atomic values or nodes, and it s possible to have sequences that contain both. In this section, we ll revisit what we ve learned about creating and manipulating such sequences so far, and introduce some new ways of generating and processing sequences using XPath.
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Sequence Types
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As we saw in the last chapter, when you declare a variable or parameter, you should use the as attribute to indicate the type of that variable or parameter. The as attribute holds a sequence type, which is an indication of the kind and number of items that the sequence held by the variable contains. Sequence types are a bit like patterns: sequence types either match or don t match a particular sequence in the same way that patterns either match or don t match a particular node. Usually, a sequence type specifies the kind of item that the sequence contains using either the name of an atomic type or a node test, and the number of items that it contains using an occurrence indicator (+ for one or more, * for zero or more, for zero or one). For example, the sequence type
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CHAPTER 7 PATHS AND SEQUENCES
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matches sequences that contain one or more xs:dateTime values, while the sequence type element(Series) matches sequences that contain a single <Series> element. While you probably won t use it elsewhere, the special atomic type xdt:anyAtomicType is useful when you want to indicate a sequence that can only contain atomic values (can t contain any nodes). For example, the sequence type xdt:anyAtomicType* matches a sequence of zero or more atomic values. Similarly, you can use the node() node test for sequences that only contain nodes. Within a sequence type, you can use the test item() to indicate any item, whether it s an atomic value or a node. For example, the sequence type item() could be used when declaring a variable that contains either an empty sequence or a single node or a single atomic value. The special sequence type void() matches the empty sequence. You d probably never use this when declaring the type of a variable or parameter (why would you want a variable or parameter that could only hold an empty sequence ), but you might use it with the instance of expression, which we ll look at when we review the testing of sequences later.
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Summary A sequence type is a pattern that matches a sequence.
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Creating Sequences with XSLT
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In the last chapter, we saw that when you use the content of a variable to set the variable s value, and have an as attribute on the variable declaration, then you create a sequence. An example was creating a sequence of xs:dateTime values holding the end times of the last program on each channel in the TV guide: <xsl:variable name="endTimes" as="xs:dateTime+"> <xsl:for-each select="Channel"> <xsl:sequence select="xs:dateTime(Program[last()]/Start) + xdt:dayTimeDuration(Program[last()]/Duration)" /> </xsl:for-each> </xsl:variable> The content of the variable declaration holds a sequence constructor. The instructions in the sequence constructor contribute items to the sequence. The <xsl:sequence> instruction, for example, can be used to add atomic values or existing nodes to the sequence. Literal result elements add new elements to the sequence, while literal text and the <xsl:value-of> instruction add new text nodes to the sequence. In XSLT 2.0, every sequence of instructions is actually a sequence constructor. The sequence of instructions held by a template, for example, determines the sequence that s generated when you apply the template to a node. The sequence of instructions inside a literal result element ibutes) of the element.
CHAPTER 7 PATHS AND SEQUENCES
Many elements allow you to select a sequence either through a select attribute or through their content. This includes <xsl:variable>, <xsl:param>, <xsl:with-param>, and <xsl:sequence>, as we saw in the last chapter. It also includes <xsl:value-of> and various other instructions that we ll meet in the coming chapters.
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