Session01 Xml Intro Overview

XML Introduction XML Programming Overview Sep-2009

© 2008 MindTree Consulting

Agenda

Introduction to XML Need for XML

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Brief History of XML

Developed in 1996 by W3C. A subset of and based upon SGML (Standard Generalized Markup Language).

Originally designed to meet the challenges of large-scale electronic publishing.

Designed to be both machine readable and human readable.

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What is XML?

XML provides a platform-neutral, language-independent means of describing data.

XML documents can be validated in many ways to ensure consistent format.

XML allows us to define your own tags, so we can create our own markup languages.

The XML specification is owned by W3C XML is about the description of data, and not its presentation.

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Cont..

XML – Extensible Markup Language Based upon HTML Describe your own tags Uses DTD ( Document Type Definition ) to describe the data XML is not a replacement for HTML XML is a language for creating other languages Documents follow the custom language a user develops from XML Labeled information in XML can be reused Need to follow the rules accordingly

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Problem with HTML

Do not give information about content of the web page Hard to be able to reuse this information HTML are hard to display from browser’s point of view because of HTML’s simplicity

Limited in areas of formatting and dynamic content

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XML Syntax XML uses a “tag markup syntax” similar to HTML. XML is case sensitive <employee> is not the same as <Employee>

Elements Element is the basic container for content

<emp id=“123”>Employee Attribute Tag

Tags

Content

Tag

Element

Start – tag  Contains element type name

End – tag Empty – element tag Slide 7

Well formed XML - example <employees> <employee id="IN9999"> Suraj <middlename>Kumar <surname>Verma <department>IT Services <project>C2 <details>, even these symbols don't bother it.]]> <employee id="IN9498"> Abhi <surname>Dhar <department>R&D Services <project/>

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Valid XML

Why validate XML at all? Valid XML data is well-formed data that also complies with syntax, structural and other rules as defined in a Document Type Definition.

Alternatives to DTD XML Schema XML Data

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XML Parsers

Two common XML Parser specifications DOM SAX

When to user SAX Large document handling Retrieving a specific value from a document Creating a subset document

When to use DOM Modifying the document Random access

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Questions

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Thank you

XML Technology, Semester 4 SICSR Executive MBA(IT) @ MindTree, Bangalore, India

By Neeraj Singh (toneeraj(AT)gmail(DOT)com ) Slide 12