1. © Keith Vander Linden, 2005 1 The applications of science have built man a well-supplied house, and are teaching him to live healthily therein. They have enabled him to throw masses of people against one another with cruel weapons. They may yet allow him truly to encompass the great record and to grow in the wisdom of race experience. - V. Bush, Atlantic Monthly, 1945

2. © Keith Vander Linden, 2005 2 Presenting Information ● HTML (http://www.w3schools.com/html/) (Chapter 2) HTMLhttp://www.w3schools.com/html/ ● XML (http://www.w3schools.com/xml/) XMLhttp://www.w3schools.com/xml/ ● World-Wide Web (http://www.w3.org) World-Wide Webhttp://www.w3.org

3. © Keith Vander Linden, 2005 3 Hypertext Markup Language ● A document formatting language that supports: – Formatted text – Images – Hyperlinks to other documents ● Working with HTML documents: – Web browsers display HTML documents – Editors create/modify HTML documents ● HTML marks up a document’s text using tags.

4. © Keith Vander Linden, 2005 4 An Example

5. © Keith Vander Linden, 2005 5

6. 6 HTML Document Structure Title_Bar_Text Web_Page_Elements

7. © Keith Vander Linden, 2005 7 HTML Tags – Title bar Acme Traders

8. © Keith Vander Linden, 2005 8 HTML Tags – Text Formatting Acme Traders Grand Rapids, Michigan, USA Phone: 1-800-555-5555 Customer Service

9. © Keith Vander Linden, 2005 9 HTML Tags – Lists How to Order Select Items View Your Shopping Cart Check Out Shipping and Returns Check on Your Order

10. © Keith Vander Linden, 2005 10 HTML Tags – Images

11. © Keith Vander Linden, 2005 11 HTML Tags – Other graphics

12. © Keith Vander Linden, 2005 12 HTML Tags – Hyper Links Planner

13. © Keith Vander Linden, 2005 13 HTML Special Characters ©acme.org (7/4/03)

14. © Keith Vander Linden, 2005 14 HTML Comments

15. © Keith Vander Linden, 2005 15 HTML Tags – Tables <table align="center" border="5" cellspacing="3" cellpadding="5"> Item Number Description Image 1 Magnet 2 Umbrella

16. © Keith Vander Linden, 2005 16 XML ● Extensible Markup Language ● An extendable generalization of HTML ● You define your own tags using a document type definition (DTD) ● Is fast becoming a standard information interchange format.

17. © Keith Vander Linden, 2005 17 An Example Class Keith Reminder Don't forget project 6! Document type definition: XML data file: Example from www.w3schools.com July, 2003

18. © Keith Vander Linden, 2005 18 Tim Berners-Lee (1955- ) World Wide Web ● late 1980’s ● Developed the key elements of the WWW: – URL - universal resource locators – HTTP - hypertext transfer protocol – HTML - hypertext markup language ● Provided the basis for an implementation of Vannevar Bush’s vision of the memex. Image from www.adlandia.dk July, 2003

19. © Keith Vander Linden, 2005 19 How Big is the WWW? ● Who really knows? – “surface” web - ~50 terabytes – “deep” web - ~7500 terabytes ● Key challenges for the 21 st century: – Mining – Filtering What’s the Big Idea