Download - The Invisible Web

The Invisible WebThe Invisible Web

Gary Price, MLISGeorge Washington University

Chris ShermanAssociate Editor

Search Engine Watch

Your Browser

How Search Engines WorkHow Search Engines Work

The Web

URL1URL2

URL3 URL4

Crawler

Indexer

SearchEngine

Database Eggs?Eggs.

Eggs - 90%Eggo - 81%Ego- 40%

Huh? - 10%

All AboutEggsby

S. I. Am

What is the Invisible Web?What is the Invisible Web?• “Stuff” that search engine crawlers

(spiders) can not -- or will not -- add to their databases

• 2 to 50 times larger than the visible Web

• Resources often much higher quality than the visible Web

What is the Invisible Web?What is the Invisible Web?• Certain file formats (PDF, Flash,

Office files, streaming media)– Why? They aren’t HTML text

• Most real-time data (stock quotes, weather, airline flight info)– Why? Ephemeral & storage intensive

What is the Invisible Web?What is the Invisible Web?• Dynamically generated pages

(cgi, javascript, asp, or most pages with “?” in URL)– Why? Spider traps

• Web accessible databases– Why? Spiders can’t type

Invisible Web GatewaysInvisible Web Gateways• Intelliseek

– http://www.invisibleweb.com– http://beta.profusion.com

• Complete Planet– http://www.completeplanet.com/

• Librarians’ Index to the Internet– http://www.lii.org

The Invisible Web The Invisible Web & The Librarian& The Librarian

The Need For Knowledge!• Awareness that the IW Exists

Maybe the IW Hold the Content Your Users Can’t Find! What is the cost in both wasted time/effort and total frustration?

• Let Others Know About the IW• Awareness of The Synonyms

– Invisible Web– Deep Web– Hidden Web

• Let the Content be Your Calling CardFocus Less on the Amount IW Data


Why is the IW Useful to the Librarian and the End User?

• Quality of Content (Authority)• Deep Content on Subject Area

(Comprehensiveness) • Focused Databases (Limited Scope)

Smaller Universe of Documents to Search (Maximize Precision/Recall)


Why is the IW Useful to the Librarian & the End User?

• Material Unavailable Elsewhere on the Web Material Unavailable Elsewhere on the Web (Uniqueness)(Uniqueness)

• Many Options to Limit, Sort, Interact with the Many Options to Limit, Sort, Interact with the DataData(Maximize Precision)(Maximize Precision)

• Timeliness vs. Time Lag of General Search Timeliness vs. Time Lag of General Search Tools (Currency)Tools (Currency)


The IW, The Librarian, The Future

• What Happens If/When the General Search Tools Crawl IW Material? Good News? Bad News?

• General Search Tools May NOT:Offer Many Interactive/Limiting ToolsMay Not be Updated/Refreshed (time lag) as FrequentlyTimeliness, making current info available is one of the things the NET does well.


The IW, The Librarian, The Future

• The Search Engine Business, Will IW Material be a Priority?

• Just One Dialog or SilverPlatter Database?NO, in Terms of Content!!!

• Yes, Common Interface, SyntaxPerhaps XML will Assist


Challenges

• It’s Not The Magic Bullet. It’s a Tool• We Still Need Traditional Online Databases• Learning Curve, Sorry!• Database Selection, When To Use the IW? • Numerous Interfaces, Syntax• A Non-Stop Flow of New Material


Things To Do!

• Build Your Own CollectionsInternet Resource Collection Development

• Mine Entire Sites, Often the IW Material Gets Little or No Notice In Reviews

• Create Links When Possible DIRECT to the Interface.

• “Save the Time of the Web Researcher”• Keep Current


• Bibliographic- OPAC’s- Subject Bibs

• Non-Bibliographic- Full-Text- Numeric- Graphic- Directory- Real-Time

Types of IW Content in Librarian Terms

Future TrendsFuture Trends• Killer apps will lead the way

– Research Index (CiteSeer)• Search engines will work harder to

“find” Invisible Web content– Inktomi (Index Connect, Ultraseek)– WhizBang (“wrappers”)

• No matter what, there will always be a problem!

Coming SoonComing Soon

Available: July 2001 CyberAge Books 0-910965-51-

Xhttp://www.invisible-web.net

Invisible Web:Invisible Web:Computer ScienceComputer Science

• MacAfee World Virus Map – http://www.mcafee.com

• ResearchIndex – http://www.researchindex.com

Invisible Web:Invisible Web:Company ResearchCompany Research

• European High-Tech Industry Database – http://www.tornado-insider.com/

radar/• Kompass

– http://www.kompass.com

Invisible Web:Invisible Web:Intellectual PropertyIntellectual Property

• Delphion Intellectual Property Network– http://www.delphion.com/

• ESP@CENET (European Patent Office) Patent Database – http://ep.espacenet.com/

Invisible Web:Invisible Web:Dictionaries & LanguagesDictionaries & Languages

• EuroDicAutom – http://eurodic.ip.lu

• Verbix – http://www.verbix.com/index.html

Invisible Web:Invisible Web:Art & ArtistsArt & Artists

• ADAM (Art, Design, Architecture & Media Information Gateway) – http://adam.ac.uk/

• Artcyclopedia – http://www.artcyclopedia.com/

Invisible Web:Invisible Web:Real-Time InformationReal-Time Information

• Flight Tracker– http://www.trip.com/ft/home/

0,2096,1-1,00.shtml• J-Track 3-D Satellite Locator

– http://liftoff.msfc.nasa.gov/realtime/JTrack/Spacecraft.html

Invisible Web:Invisible Web:Maps and Driving Maps and Driving

DirectionsDirections• MapBlast – http://www.mapblast.com

• Streetmap.co.uk– http://www.streetmap.co.uk/

Invisible Web:Invisible Web:Government InfoGovernment Info

• Parline Database – http://www.ipu.org

• United Nations Daily Press Briefings– http://www.un.org/News/

Invisible Web:Invisible Web:Health & MedicineHealth & Medicine

• Economics of Tobacco Control Database – http://www1.worldbank.org/tobacco/

database.asp• International Digest of Health

Legislation – http://www.who.int

Invisible Web:Invisible Web:News & Current EventsNews & Current Events

• Cold North Wind Newspaper Archive Project – http://www.coldnorthwind.com

• Financial Times Global Archive – http://www.globalarchive.ft.com

Invisible Web:Invisible Web:ScienceScience

• Great Barrier Reef Online Image Catalogue– http://www.gbrmpa.gov.au/corp_site/

info_services/library/index.html• Nuclear Explosions Database

– http://www.ausseis.gov.au/databases

Invisible Web:Invisible Web:TransportationTransportation

• Equasis (Merchant Ships) – http://www.equasis.org/

• World Aircraft Accident Summary (WAAS) Fatal Airline Accident Subset– http://www.waasinfo.net/