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CHAPTER 7 PATHS AND SEQUENCES
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The test position() = (1 to 3) is true if the position of the program is 1, 2, or 3.
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Summary You can often use general comparisons to perform multiple tests at the same time.
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Sometimes you might want to know not only whether a sequence contains a particular value, but also where in the sequence the value appears. You can do this with the index-of() function, which returns the position of the atomic value given in the second argument within the sequence given as the first argument. For example: index-of(('favorite', 'interesting'), @flag) will return 1 if the value of the flag attribute is 'favorite' and 2 if the value of the flag attribute is 'interesting'. If the sequence contains multiple instances of the specified value, then index-of() returns a sequence containing the positions in which the value appears. If the sequence doesn t contain the given value, then index-of() returns an empty sequence. If you re trying to locate a string within a sequence, you can give a third argument to the index-of() function to specify the collation to use. For example, you might use this to do a case-insensitive search. You learned about collations in 4. The index-of() function is most useful when you re using sequences to hold structured data. Sequences in XPath 2.0 can t contain other sequences, but you can use multiple sequences or fixed-format sequences to get something close. For example, we re currently using the following code to insert an <img> element based on the value of the flag attribute: <img src="{if (@flag = 'favorite') then 'favorite' else 'interest'}.gif" alt="[{if (@flag = 'favorite') then 'Favorite' else 'Interest'}]" width="20" height="20" /> There are three sets of values being used here: The values of the flag attribute in the source document The values of the src attribute in the new <img> element The values of the alt attribute in the new <img> element We could store these values in separate variables, as follows: <xsl:variable name="flags" as="xs:token+" select="('favorite', 'interesting')" /> <xsl:variable name="srcs" as="xs:token+" select="('favorite', 'interest')" /> <xsl:variable name="alts" as="xs:token+" select="('Favorite', 'Interest')" /> The position of the value of the flag attribute within the $flags variable gives us an index that we can use to get the appropriate src or alt value from the $srcs and $alts variables: <xsl:variable name="flag-position" as="xs:integer" select="index-of($flags, @flag)" /> <img src="{$srcs[$flag-position]}.gif" alt="[{$alts[$flag-position]}]"
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CHAPTER 7 PATHS AND SEQUENCES
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Alternatively, we could structure this information within a single sequence that contains sets of three values in which the first value is the value of the flag attribute, the second the value of the src attribute, and the third the value of the alt attribute: <xsl:variable name="flag-data" as="xs:token+" select="('favorite', 'favorite', 'Favorite', 'interesting', 'interest', 'Interest')" /> Given this structure, the first instance of the value of the flag attribute within the $flag-data variable gives an index that we can use as the basis for getting the appropriate src and alt values from $flag-data: <xsl:variable name="flag-position" as="xs:integer" select="index-of($flag-data, @flag)[1]" /> <img src="{$flag-data[$flag-position + 1]}.gif" alt="[{$flag-data[$flag-position + 2]}]" width="20" height="20" />
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Note Sequences are a lightweight way of holding structured data as an alternative to a temporary tree.
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Temporary trees are more costly because they require the processor to generate and store nodes, but they are generally easier to use because the data is labelled with the role that it plays.
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Summary The index-of() function returns the positions of a value within a sequence, or an empty
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sequence if the value doesn t appear in the sequence.
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some and every Expressions
In our stylesheet, at the same time as testing whether the flag attribute is 'favorite' or 'interesting', we also perform the following tests: contains(lower-case(tv:Series), 'news') or contains(lower-case(tv:Title), 'news') or contains(lower-case(tv:Description), 'news') These tests all do basically the same thing test whether the value of a node, converted to lowercase, contains the substring 'news'. Is there any way of combining them Well, we can create a sequence that contains the nodes that we re interested in using (tv:Series, tv:Title, tv:Description) but then we need to test each of them by using them as arguments to a function call. We can t just pass the sequence of nodes to the lower-case() function, as in contains(lower-case((tv:Series, tv:Title, tv:Description)), 'news') because the lower-case() function expects only a single item as its argument. What we need here is a way of testing each of the items in the sequence in turn, and returning true if any of
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