Metadata

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Metadata

• Xiangming Mu

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What is metadata?
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What is metadata? (cont)

• Data about data
• Any data aids in the identification, description
  and location of networked electronic resources
• Background information which describes the
  content, quality, condition, and other
  appropriate characteristics of the data David

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The role of metadata

• Data browsing
• Data transfer
• Data documentation

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Metadata examples

• Books
• Table of content
• Title, Author, abstract, etc.
• Web page
• URL
• Title, key words, up/down links, etc
• First several lines
• Image
• Title
• File name, thumbnail, key words, etc..
• Audio
• Title, Author, Date, etc.
• Topic, category, format, key notes, theme
• Video

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Examples of Metadata Standards

• Dublin Core
• MPEG-7

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Dublin Core

• The name of Dublin Core derives from a workshop
  at Dublin, Ohio (1995)
• 13 elements are initialized
• The current Dublin core elements are
• Content
• Title, Subject, Description, Source, Language,
  Relation, Coverage
• Intellectual Property
• Creator, Publisher, Contributor, Rights
• Instantiation
• Date, Type, Format, Identifier

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MPEG

• MPEG
• Moving Picture Experts Group
• The name of family of standards used for coding
  audio-visual information (e.g., movies, video,
  music) in a digital compressed format
• MPEG- 1
• Coding of moving pictures and associated audio
  for digital storage media at up to about 1.5
  Mbit/s
• Applications
• Mpeg supported video player
• Video CD
• Audio layer III of MPEG-1--MP3

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MPEG (cont)

• MPEG-2
• Generic coding of Moving Pictures and Associated
  Audio
• Video delivery ranges 2-14Mbps
• Applications
• Digital Versatile Discs (DVD)
• MPEG-4
• Coding of audio-visual objects
• Enables the coding of individual objects
• Video delivery ranges 64Kbps-4Mbps
• The industry - both formal and informal - has
  enthusiastically taken over MPEG-4 Video

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MPEG-7

• Multimedia Content Description Interface

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MPEG-7 (cont)
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(No Transcript)
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MetaLanguages XML

• eXtensible Markup Language
• a subset format of the Standard Generalized
  Markup Language (SGML)
• Is basically a SGML for the Web
• Allow users to create his own document type
• Is defined by Document Type Definitions (DTDs)

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A simple XML example
  lt?xml version"1.0" encoding"ISO-8859-1" ?gt
lt!-- Edited with XML Spy v4.2   --gt ltnotegt  
lttogtTovelt/togt   ltfromgtJanilt/fromgt  
ltheadinggtReminderlt/headinggt   ltbodygtDon't
forget me this weekend!lt/bodygt   lt/notegt