By Poornachandra Sarang
professional Apache XML completely introduces numerous subprojects came upon below the internet Services–driven API umbrella. The e-book starts off with a concise advent to XML and internet companies. next chapters dedicate themselves to express subprojects masking their reasons, APIs, implementation, and useful makes use of via applicable code examples. extra fabric includes
- Introductions to a number of of the Apache Foundation’s preferred tasks, together with Xerces, Axis, and Xindice
- Building XML–driven web pages utilizing the preferred Cocoon project
- Transforming XML–based records right into a number of codecs, together with PDF, SVG, and playstation , utilizing the Formatting gadgets Processor (FOP) project
You’lll discover ways to practice initiatives like validation, parsing, transformation, and garage and the way to paintings with this knowledge via a programming interface. you could both learn this ebook from disguise to hide or bounce to any wanted subproject for a close research of its implementation. All programming examples use the Java programming language.
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The schema allows the definition of simple and complex types. The simple types are useful for creating only unstructured data, whereas complex types allow you to create elements that contain structured data and empty elements. Both simple and complex types can be named or anonymous. You use named types if you want to reuse the definition in other element definitions. You can derive new types from both simple and complex types to extend their functionalities. After defining a schema, you can include it in the XML document by using a local file reference or a remote reference.
To extend the definition scope, we create such named data types outside the scope of any other element. Thus, the definition can be applied to all subsequent element definitions. qxd 28 4/7/06 1:23 AM Page 28 CHAPTER 1 ■ XML The preceding example creates a simple type called value. The value is of integer type, and the minimum value that can be assigned to it is 15 and the maximum is 40. Because this simple type is named, its definition can be used while defining subsequent elements. The example creates two elements called PlayerAge and RefereeAge that use the value simple type as their data type.
The list also specifies the order in which the elements should appear within the slide element. Changing this order will make the document invalid. An element can be omitted in the document if it is declared optional in the definition. You will see how to create an optional element in the subsequent section. An Element Can Be Empty An element can be empty; this means that it does not contain any child elements. The use of the keyword EMPTY indicates that the given element does not contain any child elements.