XML Demystified

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100 XML Demystifi ed Notice the XML is properly formed; however, there’s a mistake in the customer type attribute. The DTD provides the allowable values of “retail” or “wholesale.” If the attribute isn’t present in the XML, the customer type attribute defaults to “retail,” according to the DTD. The XML has a value of “manufacturing.” This produces a warning in the XML document, but it doesn’t prevent the XML from being parsed because it’s still properly formed XML. Try changing the customer tag to:
CHAPTER 7 XML Parsers and Transformations The DOM parser uses the tree structure to access parts of the XML document without having to read the XML document sequentially (from top to bottom), as is the case with the SAX parser. This means that a DOM parser can refer back to a previously read portion of the XML document, which is a disadvantage of using the SAX parser. The DOM parser is also capable of creating an XML document and altering an existing XML document, something that cannot be done if you use a SAX parser because a SAX parser cannot write an XML document. It is read only. However, the DOM parser has a major disadvantage in that it can only read XML documents that can fit into memory, which makes the DOM parser an unlikely choice if you need to transform very large XML documents. The available memory in the computer that runs the DOM parser must be sufficient to store the XML document; otherwise you won’t be able to use the DOM parser. Here’s how the DOM parser works. Suppose you want to parse the following XML document. Obviously it will fit into memory, so you can use a DOM parser. Figure 7-1 shows the tree structure that the DOM parser builds in memory. Jim Keogh The root is the beginning of the XML document and extends to nodes. A node is like a branch of the tree. The first node is an element node that contains the customer element. Compare Figure 7-1 to the XML document and you’ll see how the tree follows along with the structure of the XML document. Figure 7-1 The DOM parser builds a tree structure of the XML document in memory. 101
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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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Page 72 and 73: 52 Inside an XML Schema XML Demysti
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Page 78 and 79: 58 XML Demystifi ed Here’s how to
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Page 82 and 83: 62 Working with Whitespace Characte
Page 84 and 85: 64 XML Demystifi ed in the next exa
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Page 90 and 91: 70 An Inside Look at XLink XML Demy
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Page 98 and 99: 78 XML Demystifi ed For example, yo
Page 100 and 101: 80 XPointer XML Demystifi ed Number
Page 102 and 103: 82 5. onRequest is similar to XML D
Page 104 and 105: 84 What Is XSLT? XML Demystifi ed E
Page 106 and 107: 86 XML Demystifi ed You’re ready
Page 108 and 109: 88 XML Demystifi ed Style instructi
Page 110 and 111: 90 XML Demystifi ed The element d
Page 112 and 113: 92 XML Demystifi ed You really want
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Page 116 and 117: 96 Parsing an XML Document XML Demy
Page 118 and 119: 98 XML Demystifi ed The Content Han
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Page 132 and 133: 112 XML Demystifi ed Each channel c
Page 134 and 135: 114 XML Demystifi ed language code
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Page 152 and 153: 132 XML Demystifi ed The if…then
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Page 156 and 157: 136 Retrieving the Value of an Attr
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Page 160 and 161: 140 Bob Dylan The Times They Are A
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150 XML Demystifi ed However, acces
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152 XML Demystifi ed You’ll notic
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154 XML Demystifi ed document.all("
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156 { var xslProcessor; var xslTemp
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158 CD Listing UPC Artist Title
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160 XML Demystifi ed accessed from
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162 XML Demystifi ed in the browser
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164 XML Demystifi ed The second lin
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166 The InsertLast() Method XML Dem
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168 Sony 1990-10-25 Phish Live Ph
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170 Phish Live Phish, Vol. 15 26.9
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172 XML Demystifi ed before that. T
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174 XML Demystifi ed value="Live Ph
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176 Rush Rush in Rio 13.98 Atlanti
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178 XML Demystifi ed return; } var
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180 The DeleteNodes() Function XML
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182 XML Demystifi ed functions that
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184 XML Demystifi ed The DOMDocumen
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186 CD Listing Summary XML Demystif
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188 XML Demystifi ed 7. The appendC
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190 XML Demystifi ed 4. What does t
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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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