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CHAPTER 1 INTRODUCTION TO XML
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This XML document also includes a comment describing its purpose: <!-- This XML document describes a DVD library --> I ve added this comment as a guide for anyone reading the XML document. As with XHTML, developers normally use comments to add notations. The document or root element is called <library>. You ll notice that all elements within the document appear between the opening and closing <library> tags. The document element contains a number of <DVD> elements, and each <DVD> element contains <title>, <format>, and <genre> elements. The <DVD> element also contains an id attribute: <DVD id="1"> <title>Breakfast at Tiffany's</title> <format>Movie</format> <genre>Classic</genre> </DVD> The <title>, <format>, and <genre> elements each contain text. You can understand the structure and the contents of this document easily by looking at the tag names. It s obvious, even without the comment, that this document describes a list of DVDs. You can also easily infer the relationship between all of the elements from the document.
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Understanding the Structure of an XML Document
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Each XML document is divided into two parts: the prolog and the document or root element. The prolog appears at the top of the XML document and contains information about the document. It s a little like the <head> section of an XHTML document. In the XML document example, the prolog includes an XML declaration and a comment. It can also include other elements, such as processing instructions or a Document Type Definition (DTD). You ll find out more about these later in the Processing Instructions and DTDs and XML Schemas sections. Well-formed XML documents must have a single document element that may optionally include other content. Any content within an XML document must appear within the document or root element. In the example XML document, the document element is <library>, and it contains all of the other elements. You might wonder about the names that I ve chosen for the elements within the XML document. You re free to use any name for elements and attributes, providing that they conform to the rules for XML names. Figure 1-1 shows the structure of an XML document.
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CHAPTER 1 INTRODUCTION TO XML
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Figure 1-1. The structure of an XML document
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Naming Rules in XML
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Elements, attributes, and some other constructs have names within XML documents. A name is made up of a starting character followed by name characters. Don t forget that XML names are case-sensitive. The starting character must be a letter or underscore; it can t be a number. The name characters can include just about any other character except a space or a colon. Colons indicate namespaces in XML, so you shouldn t include them within your names. You ll learn more about namespaces in 2. To be sure that you re using legal characters, it s best to restrict yourself to the uppercase and lowercase letters of the Roman alphabet, numbers, and punctuation, excluding the colon.
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CHAPTER 1 INTRODUCTION TO XML
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If you re authoring your own XML content as opposed to generating it automatically, it s probably a good idea to adopt a standardized naming convention. You should also use descriptive names. I prefer to write in CamelCase and start with a lowercase letter, unless the element name is capitalized normally: <camelCaseElementName>Here is an element name</camelCaseElementName> I tend to avoid using underscore characters in my names because I think it makes them harder to read. The use of descriptive names makes it easier for humans to interpret the content. Imagine the difficulty you d have with this: <zyxtr>Some content</zyxtr> Let s summarize the rules for XML names: XML names cannot start with a number or punctuation. XML names cannot include spaces. Don t include a colon in a name unless it indicates a namespace. XML names are case-sensitive. I ll describe the contents of an XML document in more detail. I ll start by showing you the elements that can appear in the prolog.
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