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:elements –Content: Title, Subject, Description, Source, Language, Relation, Coverage –Intellectual Property Creator, Publisher, Contributor, Rights –Instantiation Date, Type, Format, Identifier

8. 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’)

13. 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)

14. A simple XML example Tove Jani Reminder Don't forget me this weekend!