XML in Action by William J. Pardi

By William J. Pardi

Extensible Markup Language (XML) is the common structure for facts on the internet. It permits builders to simply describe and bring wealthy, dependent information from any program in a regular, constant means. "XML in motion" is a beneficial, insightful advisor for a turning out to be military of HTML/Web authors desirous to boost richer and extra effective net purposes and web content utilizing XML as featured in Microsoft net Explorer five (supported through Netscape as well). "XML in motion" is a important blueprint for impactful, hard-working websites.

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Xml file on the companion CD) and adds an entity reference: Code Listing 4-3. htm')"> Figure 4-4. An XML document that uses entities. ENTITY SIGNATURE "Colleen"> When the document is processed, at each location in which the SIGNATURE entity is referenced, the content will appear changed, as shown in Figure 4-5. Figure 4-5. Changing an entity declaration changes content throughout the document. Parameter Entities Although parameter entities work in much the same way that general entities work, they have one important syntactical difference.

This is where the notion of subclassing comes in. DTD Structure A DTD can comprise two parts: an external DTD subset and an internal DTD subset. An external DTD subset is a DTD that exists outside the content of the document, which is usually the case when a common DTD is used, as in the medical example above. An internal DTD subset is a DTD that is included within the XML document. A document can contain one or both types of subsets. If a document contains both, the internal subset is processed first and takes precedence over any external subset.

Since most readers will probably be more familiar with HTML than with SGML, HTML is used here as a reference to the XML included in this section. As you know, HTML and XML are both applications of SGML. Because HTML and XML have the same parent language, the similarities in the syntax of both are obvious. But these similarities do not go very deep. Opening and Closing Tags In HTML code, an element usually contains both opening and closing tags. XML, unlike HTML, requires that a closing tag be used for every element.

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