2 yahoo wwwyahoocom supports a query syntax that

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Unformatted text preview: The three major elements of an Internet search engine are as follows: 1. Search request interface, which allows the users to provide description of the desired information to the search engine. Depending on the complexity of this element, the search engine may allow specifications of simple keywords, combination of keywords using boolean operators and exclusion/inclusion operators, specification of phrases, and title and URL limiters. 2. Information discoverer, which discovers information from the WWW and creates a database for the search engine, which is used to locate useful information during the search process. The information discoverer accrues this information in two-ways: (a) in the manual method, authors provide information about their websites to the search engine; (b) in the automatic method, the information discoverer collects the information using programs, such as web crawlers, spiders, robots. These programs periodically roam on the Internet storing links of information about each page they visit as well as their associated hyperlinks. The information discoverer creates an index from the results of the automated search. If the web page is changed or updated, the spider finds these changes and the index is updated. 3. Presenter of search results, which returns the results of the search, ranking them in the order it believes, is most relevant to the search. Search engines often list the results of the search in accordance to a relevance score. Relevance scores reflect the number of times a search term appears in a web page. Some search engines also allow the user to control the relevance score by giving different weights to each search word. Categories of Internet Search Engines Internet search engines are normally categorized into the following four categories: 1. Natural Language Search Engines. These search engines allow the users to submit search phrases in natural languages such as English, Hindi, Japanese, etc. instead of using boolean operators to link keywords. , 2. Subject Directories Search Engines. These search engines present the results of searches in hie...
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