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XML
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Extensible Markup Language or (XML ) is a mark up language that provides a format for describing structured data. This enables more processing of content and more accurate search results across different platforms.XML brings a new breed of web based data viewing and manipulation applications.
XML is a component of SGML (Standard Generalized Markup Language) that is made usable and effective for delivery over the web. XML standards are defined by the World Wide Web Consortium ( W3C ) and they affirm the uniformity of the structured data and its independence of any application or vendors. HTML simply tells how to display data in a browser while XML defines the content. XML documents are extensible,structured and self- validating. You may define as many tags as you want with XML.XML programming language provides a framework for tagging structured data. An XML element can declare its data to be a retail price, book title or any other desired data element.
XML provides a means of including Metadata in web documents. Metadata stands for information about information. The display of XML documents is typically accomplished with style sheets such as Extensible Style Language( XSL ) and Cascading Style Sheets (CSS).
XML is only a specification. A document is entitled to be called an XML document only if it adheres to the rules laid down in the XML specification. XML documents are designed for use by XML processors. XML processor has a component called the XML parser that analyzes XML markup and determines the structure of the document data.
Its primary purpose is to facilitate
the sharing of structured data across different information systems,
particularly via the Internet. It is used both to encode documents and serialize
data. In the latter context, it is comparable with other text-based
serialization languages such as JSON and YAML.
XML documents are made up of storage
units called entities which contain either parsed or unparsed data. Parsed data
is made up of characters, some of which characters data, and some of which form
mark up. Markup encodes a description of the document’s storage layout and
logical structure. XML provides a mechanism constraint on the storage layout and
logical structure.
XSL
The XSL Working Group is responsible
for the Extensible Style sheet Language (XSL), including both XSL
Transformations (XSLT) and XSL Formatting Objects (XSL/FO). They moved into the
W3C Architecture Domain at the start of 2003. XSL (the Extensible Style sheet
Language) is far more sophisticated than CSS. One way to use XSL is to transform
XML into HTML before it is displayed by the browser.
An XSL style sheet specifies the
presentation of a class of XML documents by describing how an instance of the
class is transformed into an XML document that uses the formatting vocabulary.
In order to display XML documents, it
is necessary to have a mechanism to describe how the document should be
displayed. One of these mechanisms is Cascading Style Sheets (CSS), but XSL
(Extensible Style sheet Language) is the preferred style sheet language of XML,
and XSL is far more sophisticated than the CSS used by HTML.
XSL is a language that can transform
XML into HTML, a language that can filter and sort XML data and a
language that can format XML data, based on the data value, like displaying
negative numbers in red. XSL helps you to add completely new elements into the
output file, or remove elements. It can rearrange and sort the elements, test
and make decisions about which elements to display.
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