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Ex tensible M arkup L anguage

Ex tensible M arkup L anguage. X. M. L. ASHIMA KALRA. INDEX…. INTRODUCTION OF XML XML FEATURES XML SYNTAX XML ELEMENTS XML ATTRIBUTES USES OF XML. Introduction. XML was designed to describe data and to focus on what data is.

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Ex tensible M arkup L anguage

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  1. Extensible Markup Language X M L ASHIMA KALRA

  2. INDEX…. • INTRODUCTION OF XML • XML FEATURES • XML SYNTAX • XML ELEMENTS • XML ATTRIBUTES • USES OF XML

  3. Introduction • XML was designed to describe data and to focus on what data is. • HTML was designed to display data and to focus on how data looks. BACK

  4. What you should already know? • WWW, HTML and the basics of building Web pages • Web scripting languages like JavaScript or VBScript

  5. What is XML? • XML stands for Extensible Markup Language • XML is a markup language much like HTML • XML was designed to describe data • XML tags are not predefined. You must define your own tags • XML uses a Document Type Definition (DTD) or an XML Schema to describe the data • XML with a DTD or XML Schema is designed to be self-descriptive

  6. Features of XML • XML does not DO anything • XML is free and extensible • XML is a complement to HTML • XML is a cross-platform, software and hardware independent tool for transmitting information. BACK

  7. XML Syntax BACK

  8. Syntax Rules • All XML elements must have a closing tag Incorrect <p>This is a paragraph <p>This is another paragraph Correct <p>This is a paragraph</p> <p>This is another paragraph</p>

  9. XML tags are case sensitive <Message>This is incorrect</message> <message>This is correct</message> • All XML elements must be properly nested <b><i>This text is bold and italic</b></i>

  10. All XML documents must have a root element <root> <child> <subchild>.....</subchild> </child> </root> BACK

  11. Attribute values must always be quoted <?xml version="1.0" encoding="ISO-8859-1"?> <note date=12/11/2002> <to>Tove</to> <from>Jani</from> </note>

  12. With XML, white space is preserved Hello              my name is Tove, HTML output: Hello my name is Tove, XML output: Hello              my name is Tove,

  13. Comments in XML The syntax for writing comments in XML is similar to that of HTML. <!-- This is a comment --> BACK

  14. XML Elements • XML Elements are Extensible <note> <to>Tove</to> <from>Jani</from> <body>Don't forget me this weekend!</body> </note> BACK

  15. MESSAGE To: ToveFrom: Jani Don't forget me this weekend!

  16. <note> <date>2002-08-01</date> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> </note> BACK

  17. <note> <date>2002-08-01</date> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>

  18. Element Naming • Names can contain letters, numbers, and other characters • Names must not start with a number or punctuation character • Names must not start with the letters xml (or XML or Xml) • Names cannot contain spaces BACK

  19. XML Attributes • XML elements can have attributes. • Quote Styles, "female" or 'female'? <person sex="female"> <person sex='female'> BACK

  20. If the attribute value itself contains double quotes it is necessary to use single quotes, like in this example:  <gangster name='George "Shotgun" Ziegler'> • If the attribute value itself contains single quotes it is necessary to use double quotes, like in this example:  <gangster name="George 'Shotgun' Ziegler"> BACK

  21. Uses of XML • XML can Separate Data from HTML • With XML, data is stored outside HTML • XML is used to Exchange Data • With XML, data can be exchanged between incompatible systems • XML and B2B • With XML, financial information can be exchanged over the Internet. BACK

  22. Uses of XML • XML can be used to Share Data • XML provides a software- and hardware-independent way of sharing data • XML can be used to Store Data • With XML, plain text files can be used to store data

  23. Uses of XML • XML can make our Data more Useful • Since XML is independent of hardware, software and application, you can make your data available to other than only standard HTML browsers • XML can be used to Create new Languages • XML is the mother of WAP and WML BACK

  24. THANKYOU

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