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Therefore, that is where I will start this book. In this chapter, you will learn the rules for writing XML documents, regardless of the specific custom markup language in which you are writing. One big difference between the two documents, however, is that the tags used by an XML document are created by the author.
XML documents should be rather self-explanatory in that the tags should describe the data they contain Figure 1. The document contains the name of the wonder, as well as its location and its height in feet. The next line begins the data part of the document and is called the root element. In an XML document, there can be only one root element.
The next 3 lines are called child elements, and they describe the root element in more detail. Colossus of Rhodes Rhodes, Greece The last child element, height, contains an attribute called units which is being used to store the specific units of the height measurement. Attributes are used to include additional information to the element, without adding text to the element itself. Finally, the XML document ends with the closing tag of the root element.
This is a complete and valid XML document. Nothing more needs to be written, added, annotated, or complicated. This is done by creating a new root element which will contain as many elements as desired.
This is called the root element.
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The two elements name and Name are actually considered completely different and independent. The bottom example is incorrect since the opening and closing tags do not match.
It is defined by a set of rules, the most important of which are described below. If your document satisfies these rules, it is considered well-formed. Once a document is considered well-formed, it can be used in many, many ways.
A root element is required Every XML document must contain one, and only one, root element. This root element contains all the other elements in the document. The only pieces of XML allowed outside preceding the root element are comments and processing instructions Figure 1.
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Closing tags are required Every element must have a closing tag. Elements must be properly nested If you start element A, then start element B, you must first close element B before closing element A Figure 1.
Case matters XML is case sensitive. Figure 1.
They can be single or double, as long as they match each other. Notice that all elements are properly nested; that is, none are overlapping.
An XML element is the most basic unit of your document.
It can contain text, attributes, and other elements. An element has an opening tag with a name written between less than signs Figure 1. An element is generally concluded with a closing tag, comprised of the same name preceded with a forward slash, enclosed in the familiar less than and greater than signs.
XML: Visual QuickStart Guide
Elements may have attributes. Information contained in an attribute is generally considered metadata; that is, information about the data in the element, as opposed to the data itself.
An element can have as many attributes as desired, as long as each has a unique name. The rest of this chapter is devoted to writing elements, attributes, and values. The first is at Peachpit Press' site.
It contains the Table of Contents, all the Source code and Examples, an excerpt of one of the chapters, and more. And you've already found the second companion Web site. It's right here at Cookwood Press. It's here where you'll find all of the example files , as well as the Table of Contents and Index , an Errata page hopefully short , and much more. Each XML topic is explained with short, clear, step-by-step instructions accompanied by two-color illustrations so you can see exactly what to do and what it will look like when you've done it.
You'll never have to wade through pages and pages of filler.
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Just look it up in the complete index , jump to the page and you're done. You won't find another book that gets you understanding XML for less. Check out what these readers said , or look at the pages that some of them have created. I have used the same direct, clear, but informal style with the XML book.Visual QuickStart Guide, 5th Edition. And Bruce is a highly competent and accomplished author in his own right who knows his material and presents it well.
You can read about both these applications of XML, among others, in Part 7 see page Wherever possible, examples of the concepts being discussed are displayed, and the parts of the examples on which to focus are highlighted. It allows the person writing the XML to create whatever tags they need. XML has become a very popular method for storing data and the most popular method for transmitting data between all sorts of systems and applications.
Remember, XML is designed to store and transport data, not display it. Nothing more needs to be written, added, annotated, or complicated.
Case matters XML is case sensitive.