XML Demystified

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34 Types of Document Type Definition XML Demystifi ed There are two types of document type definitions (DTD): an internal DTD and an external DTD. An internal DTD appears at the beginning of the XML document within the DOCTYPE tag, which we illustrate in the next example. Internal DTD is perfect for when only one XML document will use the DTD because the DTD is distributed in the same file as the XML document. Some developers also use an internal DTD for small documents where the DTD is unlikely to change and, especially, for those documents that will only be distributed within their organization. Avoid using an internal DTD if many XML documents share the same DTD because it isn’t economical to replicate the DTD in every XML document. Further- more, you’ll need to hunt down each of those documents whenever you want to change the DTD. Notice that the following example uses an internal DTD to define a customer for the XML document. This DTD contains a number of parent-child relationships (see Chapter 2), as you can tell from reading the definition of the customer tag. The customer tag is a parent than contains seven child elements. These are name, title, company, address, phone, email, and account_number. Three of those child elements are also parents to their own child elements. For example, name has first_name and last_name as child elements. Address has street_1, street_2, city, state, and zip as child elements. And phone has business, cell, home, and fax as child elements. The DTD ends with ]>. The XML document begins on the next line, where tags defined in the DTD identify data within the XML document.
CHAPTER 3 Document Type Defi nitions ]> Bob Smith Manager My Company Inc. The Tech Building 555 5th Street Some City NJ 07665 555-555-1212 555-555-5432 555-555-7678 555-555-9989 bsmith@mycompany.com 6970654 External Document Type Definition The external DTD is a DTD that isn’t included in an XML document. Instead, it’s placed in its own file that has a .dtd file extension. An external DTD can be shared by any XML document if you reference the DTD at the beginning of the XML document. 35
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XML DEMYSTIFIED
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84 What Is XSLT? XML Demystifi ed E
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90 XML Demystifi ed The element d
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96 Parsing an XML Document XML Demy
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100 XML Demystifi ed Notice the XML
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110 XML Demystifi ed What Is Really
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114 XML Demystifi ed language code
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118 Looking Ahead XML Demystifi ed
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122 Getting Started XML Demystifi e
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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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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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