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Understanding XML Syntax
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XML languages use tags to mark up text. As a web developer, you re probably familiar with the concept of marking up text: <p>Here is an introduction to XML.</p> The previous line is XHTML, but it s also XML. In XHTML, you know that the <p> tag indicates a paragraph of text. All of the tags within XHTML have predefined meanings. XML allows you to construct your own tags, so you could rewrite the previous markup as: <intro>Here is an introduction to XML.</intro> In this example, the <intro> tag tells you the purpose of the text that it marks up. One big advantage of XML is that tags can describe their content that s why XML languages are often called self-describing. XML is flexible enough to allow for the creation of many different types of languages to describe data. The only constraint on XML vocabularies is that they be well-formed.
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Well-Formed Documents
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XML documents are well-formed if they meet the following criteria: The document contains one or more elements. The document contains a single document element, which may contain other elements. Each element closes correctly. Elements are case-sensitive. Attribute values are enclosed in quotation marks and cannot be empty.
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CHAPTER 1 INTRODUCTION TO XML
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I ll describe all of these criteria throughout this chapter, but it s worthwhile highlighting some points now. XML languages are case-sensitive; this means that the tag <intro> is not the same as <Intro> or <INTRO>. In XML, these are three different tags. Prior to the days of XHTML, HTML was case-insensitive, so <body> and <BODY> were equivalent tags. All XML tags need to have an equivalent closing tag written in the same case as the opening tag. So the <intro> tag must have a matching </intro> tag. If no content exists between the opening and closing tags, you can abbreviate it into a single tag, <intro/>. Again, contrast this with HTML, where it was possible to write a single <p> tag to add a paragraph break. The order of tags is important in XML. Tags that are opened first must close last: <chapter><intro>Here is an introduction to XML.</intro></chapter> HTML pages had no such requirement. The following would have been correct in HTML, although unacceptable in XML: <p><strong>Paragraph text</p></strong> In XML, attributes always use quotation marks around their values: <intro type="chapter"> It doesn t matter whether these are single or double quotation marks, but they must be present. This wasn t a requirement in HTML. Similarly, some HTML attributes, such as the nowrap attribute in a <td> tag, didn t need to contain an attribute name and value pair: <td nowrap>A table cell</td> This type of tag construction isn t possible in XML. You must replace it with something like this: <td nowrap="true">A table cell</td>
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Understanding the Difference Between Tags and Elements
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You may have noticed that I ve used the terms tag and element when talking about XML documents. At first glance, they seem interchangeable, but there s a difference between the terms. The term element describes opening and closing tags as well as any content. A tag is one part of an element. Tags start with an opening angle bracket and end with a closing angle bracket. Elements usually contain both an opening and closing tag as well as the content between. The following line shows a complete element that contains the <intro> tag. <intro>Here is an introduction to XML.</intro> Now that you understand the construction rules, it s time to look at a complete XML document.
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CHAPTER 1 INTRODUCTION TO XML
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A complete piece of XML is referred to as a document. It doesn t matter whether you re dealing with XML that marks up text, information requested from a server, or records received from a database all of these are documents. Each XML document is made up of markup and character data. In general, the character data comprises the text between a start tag and an end tag, and everything else is markup. You can further divide markup into elements, attributes, text, entities, comments, character data (CDATA), and processing instructions. The following document illustrates the different parts of an XML document. You can download it, along with the other resource files, from the Source Code area of the Apress web site (http://www.apress.com). The document, called dvd.xml, describes the contents of a small DVD library: < xml version="1.0" encoding="UTF-8" > <!-- This XML document describes a DVD library --> <library> <DVD id="1"> <title>Breakfast at Tiffany's</title> <format>Movie</format> <genre>Classic</genre> </DVD> <DVD id="2"> <title>Contact</title> <format>Movie</format> <genre>Science fiction</genre> </DVD> <DVD id="3"> <title>Little Britain</title> <format>TV Series</format> <genre>Comedy</genre> </DVD> </library> I ll walk you through each part of the document. The document starts with an XML declaration: < xml version="1.0" encoding="UTF-8" > This declaration is optional and can contain a number of attributes, as you ll see shortly.
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