"The applications of science have..."

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

Presenting Information

HTML (http://www.w3schools.com/html/) (Chapter 2)

XML (http://www.w3schools.com/xml/)

World-Wide Web (http://www.w3.org)

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.

An Example

HTML Document Structure

HTML Tags – Title bar

HTML Tags – Text Formatting

HTML Tags – Lists

HTML Tags – Images

HTML Tags – Other graphics

HTML Tags – Hyper Links

HTML Special Characters

HTML Comments

HTML Tags – Tables

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.

An Example

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.

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


	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


	HTML (http://www.w3schools.com/html/) (Chapter 2)
	XML (http://www.w3schools.com/xml/)
	World-Wide Web (http://www.w3.org)


	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.


	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.


	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.


	Who really knows?
		“surface” web - ~50 terabytes
		“deep” web - ~7500 terabytes
	Key challenges for the 21^st century:
		Mining
		Filtering