XML basics

-


XML | Basics


Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.The design goals of XML focus on simplicity,generality,and usability across the Internet.It is a textual data format with strong support via Unicode for different human languages. Although the design of XML focuses on documents, the language is widely used for the representation of arbitrary data structures such as those used in web services.
  1. XML stands for extensible Markup Language
  2. XML is a markup language like HTML
  3. XML is designed to store and transport data
  4. XML is designed to be self-descriptive
Differences between XML and HTML
XML and HTML were designed with different goals:
  • XML is designed to carry data emphasizing on what type of data it is.
  • HTML is designed to display data emphasizing on how data looks
  • XML tags are not predefined like HTML tags.
  • HTML is a markup language whereas XML provides a framework for defining markup languages.
  • HTML is about displaying data,hence it is static whereas XML is about carrying information,which makes it dynamic.
EXAMPLE :
XML code for a note is given below

HTML code for the note is given below
<!DOCTYPE html>
<html>
<h1>Note</h1>
<body>
<p>To:RAJ
<br>
From:RAVI
</p>
<h1>Reminder</h1>
<p>Meeting at 8am</p>
</body>
</html>
OUTPUT :
Note : The output in both the cases is same but while using HTML we have used predefined tags like p tag and h1 tag whereas while using XML we have used self defined tags like “To” tag and “from” tag.
Another Example :
The XML above is quite self-descriptive:
  • It has sender information.
  • It has receiver information.
  • It has a heading.
  • It has a message body.
  • The tags in the example below are not defined in any XML standard. These tags are “invented” by the author of the XML document.HTML works with predefined tags like p tag, h1 tag, etc.While in XML, the author must define both the tags and the document structure.
Input :
Output :
Basically XML above does not do anything. XML is just information wrapped in tags. User must require a piece of software to send, receive, store, or display it.
XML makes web development User Friendly : Many computer systems contain data in incompatible formats. Exchanging data between incompatible systems or upgraded systems is a time-consuming task for web developers. Large amounts of data must be converted, and incompatible data is often lost. XML stores data in plain text format. This provides a software- and hardware-independent way of storing, transporting, and sharing data.
XML is Extensible : XML applications will work as expected even if data is edited i.e. added or removed. Example :The above note is edited into a newer version by adding date tag and hour tag , and by removing the heading tag.
Previous version

New Version

Comments

Post a Comment

Popular posts from this blog

BASIC ICT SKILLS - CLASS - IX

-
INFORMATION AND COMMUNICATION TECHNOLOGY Chandrakant Nanda Introduction Information and Communications Technology (ICT) can be regarded as the extension of IT as it involves the integration of IT with media transmission and broadcasting technologies. In the past few decades, Information Technology (IT) has brought a revolution in the computing and communication fields.  Today, thanks to the Internet, you can send or receive information almost about any topic in just a few seconds from any corner of the world.  The Internet also allows you to communicate with a person or a group of people simultaneously in a real-time environment.  Innovations in the IT field have affected many areas of our daily life, such as education, entertainment and health.  The revolution in the IT sector has also created many new careers in the field of software and engineering.  However, despite its numerous advantages, the IT sector poses serious problems in the form of ...
Read more

GREEN SKILLS - I

-
Image
Introduction Green economy aims to provide a high quality of life by the efficient use of natural resources.  The factors behind adopting green economy are consumption of vast amount of non-renewable resources, non-availability of mineral and energy-resources frequently and growing number of poor people. The steps towards developing green economy also make an impact on employment rate by offering green jobs which will define its significance in the future.  Green jobs can be created in different sectors, such as agriculture, industry, services or administration. These sectors may include the kinds of jobs that provide protection of ecosystems; reduce the consumption of energy, raw materials and water; and minimize waste and pollution. Now, to do such green jobs, some necessary green skills are required. Green skills are the skills required to adapt the processes, services and products for climate change in compliance with the environment rules and regulations related...
Read more

Unit-II : Computer Networks (Class XII)

-
Image
  CHAPTER-8 COMPUTER NETWORKS 8.1 Evolution of Networking: 8.1.1 Introduction to Computer Networks: Network: - To connect the more than one devices via a medium, is called network. Why do we need network? 1.      Fast and Secure Communication 2.      Resource sharing 3.      Reduce Cost 8.1.2 Evolution of Network: ARPANET: The Advanced Research Projects Agency Network ( ARPANET ) was an early packet switching network and the first network to implement the protocol suite TCP/IP. Both technologies became the technical foundation of the Internet. NSFNET:  §   The N ational S cience F oundation Net work (NSFNET) was a program created and funded by the National Science Foundation to coordinate and promote advanced research and education in networking in the United States.  §   NSFNET was founded in 1985. NSFNET was a general purpose research network wherein the connection is ...
Read more