Web indexing

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Web indexing. ICE0534 – Web-based Software Development July 21. 2005 Seonah Lee. Contents. News related to Web Indexing Web Indexing? Web Indexing: Styles Web Indexing: Tools Web Indexing in Search Engine Web Indexing in Google Summary References Question.
Web indexingICE0534 – Web-based Software Development July 21. 2005Seonah LeeContents
  • News related to Web Indexing
  • Web Indexing?
  • Web Indexing: Styles
  • Web Indexing: Tools
  • Web Indexing in Search Engine
  • Web Indexing in Google
  • Summary
  • References
  • Question
  • Google tests tool to aid Web indexingBy Dawn Kawamoto, CNET News.com, Monday , June 06 2005 12:00 AMWeb Indexing?
  • Creating indexes for
  • individual web sites
  • Intranets
  • collections of HTML documents
  • collections of web sites.
  • Purpose for
  • helping users find information using a variety of keywords and gathering similar information.
  • Web Indexing?
  • Indexes
  • systematically arranged items
  • entry points to go directly to desired information within a larger document or set of documents
  • Indexing
  • an analytic process of determining which concepts are worth indexing, what entry labels to use, and how to arrange the entries.
  • Web Indexing: Styles (1/2)
  • Back-of-the-Book Style Web Indexing
  • Including “A-Z indexes” to websites or an Intranet
  • Some web indexes take the form of a list of hierarchical categories arranged in alphabetical order
  • Web Indexing: Styles (2/2)
  • Metadata and Web Indexing
  • assigning keywords or phrases to web pages or web sites within a meta-tag field
  • so that the web page or web site can be retrieved with a search engine that is customized to search the keywords field.
  • Web Indexing: ToolsWeb Indexing: The Most Famous Tool
  • HTML Indexer, by Brown Inc.
  • http://www.html-indexer.com/index.html
  • Web Indexing in Search Engine
  • Phases of work of Web SE
  • Document gathering
  • Document indexing
  • Searching in response to a query
  • Visualization of search results
  • The WebParseGatheringQueryIndexingRank or MatchVisualizationWeb Indexing in Search Engine
  • Almost every Web Search Engine uses a slightly different technique
  • The parsing discards some html marking
  • Some give different weight to terms in different html field
  • Some do not index the full text of the document, but only part of it
  • Some make full use of “metadata”
  • Very few make use of the information provided by linking: HITS and PageRank (Google)
  • Web Indexing in Google
  • PageRank
  • Google assigns a number called the PageRank to every web page that it knows about.
  • Assumption: A page is important if other important web pages link to it
  • Each Page = Node
  • Directed Edge = a link from one to the other
  • Main PageGoogleThis PageYahooWeb Indexing in Google
  • PageRank: Example
  • Assumption: an average page has a PageRank of 1R2R2: 0.6R1R1: 1.2R3R3: 1.2
  • R1 = R3
  • R2 = R1 / 2
  • R3 = R1 / 2 + R2
  • R1 = 2R1
  • R3 = R1
  • 3 = R1 + R2 + R3
  • Web Indexing in Google
  • HITS (Hyperlink-Induced Topic Search)
  • Divides pages relating to a topic into two groups
  • Authorities: pages with good content about a topic
  • Hubs: pages that link to many authority pages on a topic (directory)
  • Iteratively calculate hub and authority scores for each page in neighborhood and rank results accordingly
  • Document that many pages point to is a good authority
  • Document that points to many authorities is a good hub, pointing to many good authorities makes for an even better hub
  • Summary
  • Web Indexing
  • Web Indexing Styles
  • Back-of-the-Book Style Web Indexing
  • Metadata and Web Indexing
  • Web Indexing Techniques in Google
  • HITS
  • PageRank
  • References
  • News
  • http://news.com.com/2100-1032_3-5730744.html
  • Definition
  • http://www.marisol.com/websiteindexing.html
  • http://taxonomist.tripod.com/indexing/paperless.html
  • http://en.wikipedia.org/wiki/Web_indexing
  • Tools
  • www.stcsig.org/idx/articles/webindexing.pdf
  • Theory
  • http://amath.colorado.edu/outreach/demos/hshi/2001Sum/pagerank.html
  • http://www.cis.strath.ac.uk/~fabioc/04-mia/lects/11.pdf
  • Question?
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