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Metadata

Metadata. Xiangming Mu. What is metadata?. What is metadata? (cont’). Data about data Any data aids in the identification, description and location of networked electronic resources

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Metadata

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  1. Metadata Xiangming Mu

  2. What is metadata?

  3. 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

  4. The role of metadata • Data browsing • Data transfer • Data documentation

  5. 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 • Title, Author, Date, etc. • Audio, transcript, key words, etc. • Video surrogates: key frame,

  6. Examples of Metadata Standards • Dublin Core • MPEG-7

  7. 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

  8. 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

  9. 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

  10. MPEG-7 • Multimedia Content Description Interface

  11. MPEG-7 (cont’)

  12. 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)

  13. A simple XML example <?xml version="1.0" encoding="ISO-8859-1" ?> <!-- Edited with XML Spy v4.2 --> <note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>

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