Networked Information Resources

Online Retrieval

Cognitive authority and IR

Two kinds of bibliographic control (Patrick Wilson)

Describing vs. Exploiting Hints of authority (Human information

behavior)

Rational calculation or blind faith

A taxonomy of web searches

Navigational queries To reach a particular site ‘Known item’ search

Informational queriesTo acquire some information assumed to be

present on one or more web pages

Transactional queries To perform some web-mediated activity

Alexa: web navigation and review

Alexa

Website traffic data/ranking

Position in directory

User-review

History (Wayback Machine)

Community (sites link here; related links; also visit)

Word and phrase search

Keyword search Phrase search

Library evaluation

“Library evaluation”

Boolean search

Combines search terms according to Boolean logic: AND, OR, NOT

The more search terms are ANDed, the more restricted, or specific, will be the search. (terms are by default ANDed with Google)

OR operator broadens the search NOT operator specify terms you do not want to

occur in the retrieved records. (Use “-” for NOT when searching Google)

Nesting Boolean operators

Hate crimes (gays OR homosexuals) (Digital OR virtual OR Internet OR web)

+museum -library

Truncation

Search different forms of a word having the same common root

A “recall” enhancing deviceNot supported by all search engines;

Automatically done with Google

Librar*

Proximity search

Allow user to specify the distance between two search terms in the retrieved results.

e.g. library NEAR evaluation (with AltaVista)

Forced stop words

Search engines automatically exclude common words in their indexese.g. OVID stopwords list

To force stop words to be matched, use “+”

Ode +to Joy

“Ode to joy”

Synonym searches

~food matches recipes, nutrition, cooking

~facts matches information, statistics

~help matches guide, tutorial, FAQ, manual

Field or meta tag search

Intitle:Inurl:Site:Intext:Inanchor:

Field or meta tag search (cont.)

Link:Daterange:Filetype:Related:Info:&restrict=countryTW

Field search

One-child law OR policy people’s OR peoples “republic of china”

"one child policy” inurl:org Intitle: “national park” inurl:org lung cancer OR neoplasm inurl:govsite:www.lib.ntu.edu.tw buddhism