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#Html xml file viewer download#
In layman’s terms, HTML is a presentation language, whereas XML is a data-description language.įor example, if you were to go to any ecommerce Website and download a product listing, you’d probably get something like this: HTML rarely (if ever) provides information about how the document is structured or what it means. XML, on the other hand, isn’t just suited to the Web – it can be used in a variety of different contexts, some of which may not have anything to do with humans interacting with content (for example, Web Services use XML to send requests and responses back and forth). HTML’s sole purpose is to allow anyone to quickly create Web documents that can be shared with other people. It becomes cumbersome if you want to display documents in a mobile device or do anything that’s even slightly complicated, such as translating the content from German to English. Okay, we know what it is, but why do we need XML? We need it because HTML is specifically designed to describe documents for display in a Web browser, and not much else. For example, with XML we can create other languages, such as RSS, MathML (a mathematical markup language), and even tools like XSLT. XML is a meta-language: a language that allows us to create or define other languages. However, it’s important to realize that XML is not just a language.
It’s much more flexible than HTML because it allows you to create your own custom tags. XML is a language that’s very similar to HTML. However, XML allows you to define your own set of tags. In fact, the elements you’ll create in XML will be very similar to the elements you’ve already been creating in your HTML documents.
The most recognizable feature of XML is its tags, or elements (to be more accurate).
Another way to think about extensibility is to consider that XML allows all of us to extend our notion of what a document is: it can be a file that lives on a file server, or it can be a transient piece of data that flows between two computer systems (as in the case of Web Services). It lets you define your own tags, the order in which they occur, and how they should be processed or displayed. The essence of XML is in its name: Extensible Markup Language. As a result, I’ve learned to keep my explanation brief. The others either roll their eyes in anticipation of hype and half-formed theories, or cringe in fear of a long, dry history of markup languages. A significant portion of the group leans forward eagerly, wanting to learn more. So, what is XML? Whenever a group of people asks this question, I always look at the individuals’ body language.
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I’ll try to stay away from the grandstanding hoopla that has characterized much of the discussion of XML instead, I’ll give you the background and know-how you’ll need to make XML a part of your professional skillset. Whenever I talk about XML with developers, designers, technical writers, or other Web professionals, the most common question I’m asked is, “What’s the big deal?” In this book, I’ll explain exactly what the big deal is – how XML can be used to make your Web applications smarter, more versatile, and more powerful. If ever there were a candidate for “Most Hyped Technology” during the late 90s and the current decade, it’s XML (though Java would be a close contender for the title). Who here has heard of XML? Okay, just about everybody.
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As always, you can download this excerpt as a PDF if you prefer. To find out more about “No Nonsense XML Web Development with PHP”, visit the book’s information page, or review the contents of the entire publication.
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And all the code used in the book is available to customers in a downloadalbe archive. It walks you through the process of building a fully-functional XML-based content management system with PHP. The title contains over 350 pages of XML and PHP goodies. Then, we’ll spend some time starting the project we’ll develop through the course of this book: building an XML-powered content management system. After we’re done exploring some terminology and examples, we’ll jump right in and start working with XML documents. We’ll cover the basics of XML – essentially, most of the information you’ll need to know to get a handle on this exciting technology.