XML Demystified

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142 <strong>XML</strong> Demystifi ed The function declaration statement must have a prefix, a function name, a parameter list, and a return value. In addition, a function declaration statement must also define a code block that contains statements that are executed when the function is called from within an XQuery. Here’s the structure of a function declaration statement: declare function prefix:function_name($parameter as datatype, ...) as returntype { ... code for the function goes here... }; Let’s declare a function. You’ll call it convertdate and it will convert the date format 2006-10-04 to October 4, 2006. The prefix will be called local. The parameter is the date that will be converted and the return value is the converted date. Here’s the function declaration. Notice that the parameter is placed within parentheses. You’ll need to give the parameter a name and specify its data type. The name is always prefaced with a $ symbol. You’ll also need to specify the data type of the value returned by the function. The return type in this example is a string. The code block is defined with open and closed French braces ({ }). This is where you place statements that execute each time the function is called. The function begins by assigning all the months to an array called $month. An array is a variable that can have many values. Next, the month-from-date() function is called to extract the month of the date and assign it to the $month variable. The day-fromdate() function and year-from-date() function are passed to the concat() function in the return clause to return the reformatted date. The function declaration statement must appear at the top of the XQuery, as we show in the following example. Think of this as defining the function before you call the function within the XQuery. The function is called later in the XQuery {local:convertdate(xs:date($cd/date))}. declare function local:convertdate($date as xs:date) as xs:string { let $months := ("January","February","March","April","May", "June","July","August","September","October","November","December") let $month := $months[month-from-date($date)] return concat($month, " ", string(day-from-date($date)), ", ", string(year-from-date($date))) };
CHAPTER 9 XQuery List of titles in this catalog: UPC Artist Title Date { for $cd in doc("catalog.xml")/catalog/cd order by $cd/artist return {data($cd/@upc)} {data($cd/artist)} {data($cd/title)} {local:convertdate(xs:date($cd/date))} } Here’s the output.html file that the XQuery produces: List of titles in this catalog: UPC Artist Title Date 74646938720 Billy Joel Songs in the Attic October 20, 1998 74640890529 Bob Dylan The Times They Are A-Changin' October 25, 1990 143
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XML DEMYSTIFIED
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XML DEMYSTIFIED JIM KEOGH & KEN DAV
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Professional Want to learn more? We
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ABOUT THE AUTHORS Jim Keogh is on t
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x XML Demystifi ed CHAPTER 3 Docume
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xii Looking Ahead 118 Quiz 118 CHAP
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xvi • Insert data into an XML doc
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xviii Chapter 7: XML Parsers and Tr
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2 XML Demystifi ed However, we’re
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4 XML Demystifi ed Columns are desc
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6 Why Is XML Such a Big Deal? XML D
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8 XML Demystifi ed The first line s
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10 XML Demystifi ed Next, reference
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12 XML Demystifi ed Why Are Corpora
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14 Quiz 1. XML cannot be used with
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18 Identifying Information XML Demy
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20 XML Demystifi ed Be sure that th
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22 street_1 street_2 city state zip
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24 XML Demystifi ed When writing th
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26 XML Demystifi ed Suppose, for ex
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28 Entities XML Demystifi ed Althou
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30 The CDATA section is defined as:
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32 7. All XML markup tags must have
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34 Types of Document Type Definitio
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36 XML Demystifi ed Let’s convert
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38 XML Demystifi ed document—they
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40 XML Demystifi ed NJ 07665 555-
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42 XML Demystifi ed XML developers
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44 XML Demystifi ed If you replace
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46 Attribute Declarations XML Demys
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48 XML Demystifi ed An external DTD
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52 Inside an XML Schema XML Demysti
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54 XML Demystifi ed Next you must r
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56 XML Demystifi ed You reference a
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58 XML Demystifi ed Here’s how to
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60 XML Demystifi ed simpleType, alt
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62 Working with Whitespace Characte
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64 XML Demystifi ed in the next exa
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66 XML Demystifi ed Number of Occur
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68 XML Demystifi ed c. Specifies th
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70 An Inside Look at XLink XML Demy
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72 XML Demystifi ed replace The lin
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74 Here’s a typical Location Path
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76 Axis Description child Contains
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78 XML Demystifi ed For example, yo
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80 XPointer XML Demystifi ed Number
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82 5. onRequest is similar to XML D
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84 What Is XSLT? XML Demystifi ed E
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86 XML Demystifi ed You’re ready
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88 XML Demystifi ed Style instructi
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90 XML Demystifi ed The element d
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192 XML Demystifi ed 17. What does
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194 XML Demystifi ed c. use=“requ
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196 XML Demystifi ed 42. xlink:show
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198 55. What is returned by round(8
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200 69. An error stops the SAX pars
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202 83. Which of the following will
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204 97. Which of the following is a
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206 Chapter 1 1. b. False 2. d. All
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208 Chapter 5 XML Demystifi ed 1. a
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210 Chapter 9 XML Demystifi ed 1. b
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212 25. c. Specifies the type of da
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214 87. b. False 88. c. 89. b. E-m
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216 complex elements, 63-65 See als
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218 Microsoft’s XML Core Services
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220 V ValidateDocument( ) function,
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