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XML: A Definition
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What you see here is an XML document, albeit a rather crude and simple one: < xml version="1.0" encoding="utf-8" > <xml> <definition>XML is a metalanguage used to describe data</definition> <usages> <usage>Use XML to describe your data and to ensure you store, transfer, and receive data in the proper format </usage> <usage>XML defines nothing; you must make up your own tags</usage> <usage>Syntax is important; XML is not forgiving for minor errors. See <![CDATA[<a href="#syntax">syntax</a>]]> for more information. </usage> </usages>
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CHAPTER 2 TAKING A CRASH COURSE IN XML
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<acronym abbreviation="XML">Extensible Markup Language</acronym> <syntax> OK, I think you get the point; we'll get to syntax later. </syntax> </xml> In the previous XML document, you will notice the similarities to Hypertext Markup Language (HTML), but don t let that fool you. Besides the < and > to define tags and the use of attributes to add information about the tags, there is very little commonality between the two languages. XML is all about data and nothing else. True, you can use a derivative language called Extensible Stylesheet Language (XSL) to format the data, but XML itself cares nothing for presentation or how you use the actual data. This also means that an XML document by itself is rather pointless. You need some kind of processor to actually make use of the data. The extensible part of the name means that you can create dialects of XML. As long as you adhere to the rules of XML, your dialect language is considered XML as well. The benefit is that you can use any XML editor or reader on your dialect XML files and the editor and reader will understand your document. An example of this is the CAML dialect in SharePoint or Extensible Application Markup Language (XAML) used in Windows Presentation Foundation and workflows. The good thing about XML is that it is completely open. If you think back about a decade or two and try to remember which word processor you used to write that very important contract, you are likely to find that, even with your most trusted storage medium, the file is simply unreadable because the software used to interpret the file is gone. XML has the shelf life of plutonium. No matter how long it takes before you need to reopen your very important file, you can always crack the file open with a text editor to extract everything you need. The original program used to author the file may have been pushing daisies for the last 20 years, but you can still get to your data.
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XML Syntax
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The syntax of XML resembles HTML, so if you are familiar with HTML, you should easily understand the syntax of XML as well. However, although HTML is a very loose language, XML follows strict syntax rules. In fact, XML interpreters are forbidden by the standard to attempt to interpret errors in a document. So, to make sure that you know the rules, I ll walk you through the syntax of XML.
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Note The good thing about a strict language, such as XML, C#, or mathematics, is that as long as you
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follow the rules, you always get the same result, and you don t make mistakes. This is very unlike loose or natural languages such as English or HTML where one thing may mean something completely different to two different people or browsers.
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CHAPTER 2 TAKING A CRASH COURSE IN XML
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Elements
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XML consists of elements, often referred to as tags. An element looks like this: <element></element> Anything inside those elements is considered data. That data can comprise new elements, referred to as child elements, or it can contain literal data such as the string Hello, world! Here s one example: <element> <childtag></childtag> </element> And here s another example: <element>Hello, world!</element> If your element does not contain any data, you can shorten the start-tag and end-tag combo. For instance, the following: <element></element> is exactly the same as this: <element/> Unlike HTML, XML is very case sensitive. In other words, the following: <Element> is not the same as this: <element> Also, unlike HTML parsers such as browsers, XML parsers are forbidden to try to fix such errors and should instead return an error to the user.
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