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XML

XML or Extensible Markup Language is a document markup language for saving defined and structured information, so it allows to be used within applications such as configuration files, databases...

XML Declaration

The XML declaration statement is a required element of an XML document. It tells the user agent that the document is an XML document and what version of XML it is using. The XML declaration statement is a required part of the XML prolog and must be present to write a well-formed XML document.

Example:  <?xml  version="1.0">  html  PUBLIC  "­//W3C//DTD  XHTML  1.0  Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1­strict.dtd">

XML Schema

An  XML  schema  is  a  road  map  for  the  XML  document  similar  to  a  Document  Type Definition  (DTD).  Created  by  the  World  Wide  Web  Consortium  (W3C),  schemas describe the elements and map out the presentation and nesting of XML documents. Essentially, the schema enables all applications to understand the flow of the page and validate the elements.