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The lexical representation of the atomic value
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Caution There are some changes here from the behavior of the string() function in XPath 1.0. You
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now get an error if you attempt to convert a sequence that contains more than one node, and when converting a number to a string you get 'INF' rather than 'Infinity' and '-INF' rather than '-Infinity', and the string representation of the number might include an exponent. The string() function also behaves subtly differently from the xs:string() function; in particular, it gives you the string value of a node rather than the string value of the typed value of the node (the distinction is only important if you re using SchemaAware processing) and returns an empty string from an empty sequence (whereas xs:string() will return an empty sequence).
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Summary The number() function converts a value to a number, and the string() function converts
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Testing If an Element Has a Value
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We ve seen how to test if an element is present, but what if the element is present but doesn t have a value For example, the EastEnders program is represented by the following XML in TVGuide.xml: <Program> <Start>2001-07-05T19:30:00</Start> <Duration>PT30M</Duration> <Series>EastEnders</Series> <Title></Title> <Description> ... </Description> ... </Program> The <Title> element is empty because EastEnders episodes don t have individual titles. Other programs have individual titles for episodes in a series, and still others aren t part of a series. We ve chosen to represent this in our XML by always having a <Series> element and a <Title> element. If the program isn t part of a series, then the <Series> element is empty; if the program hasn t got an individual title, then the <Title> element is empty. When it comes to the HTML, we have the following possibilities:
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<span class="title">Series</span> <span class="title">Series - <span class="subtitle">Title</span></span> <span class="title">Title</span>
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Note We re currently only recognizing the first possibility, which is why several of the programs in the
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program listing haven t got titles at the moment.
Which of these possibilities we use depends on the string values of the <Series> and <Title> elements. If they don t have a string value, then they are empty. You can get the string value of an element using the string() function. If the resulting string has any characters in it, then it will evaluate as true in a test attribute; if the element is empty, the string is empty, and the condition will evaluate to false. Therefore we can use the following XSLT in the template for the <Program> element to insert the correct XML: <xsl:template match="Program"> ... <xsl:apply-templates select="Start" /><br /> <span class="title"> <xsl:choose> <xsl:when test="string(Series)"> <xsl:value-of select="Series" /> <xsl:if test="string(Title)"> - <span class="subtitle"><xsl:value-of select="Title" /></span> </xsl:if>
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<xsl:otherwise> <xsl:value-of select="Title" /> </xsl:otherwise> </xsl:choose> </span> <br /> ... </xsl:template> This version is used in TVGuide9.xsl. When you transform TVGuide.xml with TVGuide9.xsl and look at the result (TVGuide9.html) you should see that every program has a title, and that some of them have subtitles as well. For example, BBC2 is showing four programs, the last of which has a pretty racy subtitle (which may contribute to the fact that it s flagged as interesting!), as shown in Figure 4-8.
Figure 4-8. Viewing TVGuide9.html in Internet Explorer
Alternatively, you could use similar conditions within the templates for the <Series> and <Title> elements. See if you can achieve the same output as shown previously using separate templates for <Series> and <Title> elements instead.
Testing the Contents of Strings
There are several functions that come in handy when testing the content of element and attribute values:
CHAPTER 4 CONDITIONS
compare() starts-with() ends-with() contains() matches()
COLLATIONS
Strings are usually compared, in XSLT 2.0, by comparing the Unicode codepoints of the characters that they contain. For example, 'a' comes before 'b' because the Unicode codepoint for 'a' (#x61) is less than the Unicode codepoint for 'b' (#x62), and 'C' comes before 'c' because the Unicode codepoint for 'C' (#x43) is less than the Unicode codepoint for 'c' (#x63). However, there are other ways to compare strings. For example, you might want to compare strings such that capital letters are sorted after their lowercase equivalents. Or you might want to do a case-insensitive comparison, such that 'C' and 'c' are treated as the same character. For some languages, you might even want to have particular combinations of characters be treated specially; the XPath 2.0 Functions and Operators spec uses the example of 'uve' and 'uwe' being the same in some European languages. To carry out string comparisons and sorting based on something other than Unicode codepoints, you need to use collations. Collations are definitions of how strings should be compared, and are identified via a URI. For example, the URI for the collation based on Unicode codepoints is http://www.w3.org/2005/04/xpath-functions/collation/codepoint
Caution This URI is the one used in the latest version of the Functions and Operators document as I write this. Check the latest version of the Functions and Operators document at http://www.w3.org/TR/ xpath-functions/#collations to get the correct URI when you re reading this.
Whenever you use a function that needs to compare strings, such as the compare() function or the contains() function, you can specify a collation to use for the comparison as the last argument. For example, to see whether the string value of the <Description> element contains the string 'sport', based on the Unicode codepoint collation, you can use contains(Description, 'sport', 'http://www.w3.org/2005/04/xpath-functions/collation/codepoint') If you don t specify a collation explicitly, then the XSLT processor will use a default collation. Different processors support different sets of collations, and may have different default collations (though it s likely that most will use the Unicode codepoint collation as their default), so you should look at the documentation of the processor that you re using to determine which collations are available and which will be used as the default. It s likely that in the future, IANA will provide a registry for collations, and that XSLT processors will pick the collations that they support from that register.
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