If you remove a tag and try to open that file in one of the Office programs, you will see an error message, and the program will stop you from using the file. ![]() For example, in the previous code sample, every opening tag has a closing tag, so the sample adheres to one of the rules for being well-formed. If a file doesn't conform to those rules, XML stops working. A well-formed XML file conforms to a set of very strict rules that govern XML. You may hear someone from your IT department mention "well-formed" XML. The browser ignores your XML tags and displays just the data. Izzy Siamese 6 yes no Izz138bod Colin Wilcox For instance, if you paste that XML structure into an HTML file and view the file in your browser, the results will look something like this: The ability to create tags that define almost any data structure is what makes XML "extensible."īut don't confuse the tags in that code sample with tags in an HTML file. For example, you know this is data about a cat, and you can easily find the cat's name, age, and so on. You can see that XML tags make it possible to know exactly what kind of data that you are looking at. For instance, say that you need to store and share information about pets. XML allows you to create any tag that you need to describe your data and the structure of that data. HTML is limited to a predefined set of tags that all users share. You can, however, wrap your XML data in HTML tags and display it in a Web page. That portability is why XML has become one of the most popular technologies for exchanging data. Put another way, you can use one system to generate your data and mark it up with XML tags, and then process that data in any number of other systems, regardless of the hardware platform or operating system. For example, if you have a block of sales data and each item in the block is clearly identified, you can load just the items that you need into a sales report and load other items into an accounting database. When you describe the structure and meaning of your data, you make it possible to reuse that data in any number of ways. In XML the tags define the structure and meaning of your data - what the data is. In HTML, the tags define the look and feel of your data - the headlines go here, the paragraph starts there, and so on. HTML and XML documents contain data that is surrounded with tags, but that is where the similarities between the two languages end. In the source code for this article, the HTML tags do a variety of jobs, such as define the beginning and end of each paragraph (. Tags in HTML and XML documents are easy to recognize because they are surrounded by angle brackets. If you browse through it (in Microsoft Internet Explorer, right-click the page, and then click View Source), you will see a mix of readable text and Hypertext Markup Language (HTML) tags, such as and. The HTML code for this article is a good example of computer markup at work. In computing, "mark up" has also evolved into "markup." Markup is the process of using codes called tags (or sometimes tokens) to define the structure, the visual appearance, and - in the case of XML - the meaning of any data. If you have ever used the Track Changes feature in Microsoft Office Word, you have used a computerized form of mark up. ![]() Marking up a document is how we define the structure, meaning, and visual appearance of the information in the document. They tell students to move paragraphs, clarify sentences, correct misspellings, and so on. For example, school teachers mark up student papers all of the time. People have created documents for centuries, and for just as long they have marked up those documents. To understand XML, it helps to understand the idea of marking up data. In this articleĪ brief look at mark up, markup, and tagsĪ peek at XML in the Microsoft Office System But what is XML, exactly? This article explains the basics of XML - what it is and how it works. You may have heard of Extensible Markup Language (XML), and you may have heard many reasons why your organization should use it.
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