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Besser--Dublin Core Metadata 2/14/02 1 Dublin Core Metadata Howard Besser UCLA School of Education & Information http://www.gseis.ucla.edu/~howard
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Besser--Dublin Core Metadata 2/14/02 2 Metadata for Digital Libraries - Models for Digital Libraries Importance of Metadata Standards Types and Uses of Metadata Discovery Metadata: The Dublin Core
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Besser--Dublin Core Metadata 2/14/02 3 Key problems we’re facing Discovery Longevity- Interoperability-
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Besser--Dublin Core Metadata 2/14/02 4 Traditional Digital Library Model DL user search & presentation
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Besser--Dublin Core Metadata 2/14/02 5 Ideal Digital Library Model DL user search & presentation
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Besser--Dublin Core Metadata 2/14/02 6 For Interoperability Digital Libraries Need Standards Descriptive Metadata for consistent description Discovery Metadata for finding Administrative Metadata for viewing and maintaining Structural Metadata for navigation ... Terms & Conditions Metadata for controlling access...
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Besser--Dublin Core Metadata 2/14/02 7 Why are Standards and Metadata consensus important? Managing digital files over time Longevity Interoperability Veracity Recording in a consistent manner Will give vendors incentive to create applications that support this
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Besser--Dublin Core Metadata 2/14/02 8 Why Standards? Why do we need standards? – To make information universally available to users – facilitate sharing and interchange of information – To preserve information (make it safe from changes in hardware and software) Standards only work if communities widely accept them, but they’re necessary for communities to work together
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Besser--Dublin Core Metadata 2/14/02 9 Why are you Managing this Information? Organizational mission & type Users Uses
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Besser--Dublin Core Metadata 2/14/02 10 Questions to Ask What communities is this standard designed for? What type of information is this standard designed to handle? What functions is this standard designed to serve? What previous standards is it built upon? Does the standard prescribe how to create new records (or parts of records), or how to map from existing records? How far does the standard go? Semantics: Does it define element sets? Rules? Syntax?-
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Besser--Dublin Core Metadata 2/14/02 11 What is Metadata _ Structured data describing other data used to find or help manage information resources _ Aids in interoperability _ Titles, dates, captions, cataloging and indexing data, file headers, rights info, provenance, code books, transaction logs,... _ One person’s metadata is another’s data
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Besser--Dublin Core Metadata 2/14/02 12 Sorting through the Standards Morass _ Data Structures (DC, CDWA, MARC, VRA Core, TEI, EAD, MESL data dict) _ Data Interchange (Z39.50) _ Data Values/vocabularies (LCSH, AAT, ULAN, TGN) _ Data Content/syntax (AACR2)
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Besser--Dublin Core Metadata 2/14/02 13 Semantics/Syntax/Structure _ Semantics – meaning, as defined by a community to meet their particular needs (DC) _ Syntax – a systematic arrangement of data elements for machine processing – facilitates the exchange and use of metadata among various applications (HTML, XML, RDF) _ Structure – a formal arrangement of the syntax with the goal of consistent representation of the semantics (rules defining field contents like 1/11/99)
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Besser--Dublin Core Metadata 2/14/02 14 What is Metadata Types & Uses lots of different ways of dividing the clusters
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Besser--Dublin Core Metadata 2/14/02 15 Uses of Metadata _ Discovery & Retrieval _ Identification/Provenance _ Rights Management _ Viewing _ Integrity _ Longevity _ Content rating
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Besser--Dublin Core Metadata 2/14/02 16 Containers and Packages of Metadata Warwick, not MARC _ modular _ overlapping _ extensible _ community-based _ designed for a networked world to aid commonality btwn communities while still providing full functionality within each community
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Besser--Dublin Core Metadata 2/14/02 17 Some different schemes where Metdata is kept _ embedded withing the object (HTML tags) _ in a separate related DB maintained by same organization (OPAC, MOA II) _ in a separate DB maintained by a separate organization (Books in Print, ratings systems) _ derived on-the-fly from a different scheme (MARC-to-DC)
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Besser--Dublin Core Metadata 2/14/02 18 Collaborative Metadata Projects Dublin Core NSF/ERCIM Digital Collaboratory OCLC CORC Project- Visual Resources Association (VRA) Core Encoded Archival Description (EAD) Computerized Interchange of Museum Information (CIMI)- Records Export for Art and Cultural Heritage (REACH)
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Besser--Dublin Core Metadata 2/14/02 19 Dublin Core (3/95) _ improve resource discovery _ anticipate precision problems of Web Crawler- based searching tools _ existing metadata could be “dumbed down” _ elements should be simple to understand and use, so that any individual should be able to assign terms him/herself _ software might eventually automatically generate very base-level metadata
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Besser--Dublin Core Metadata 2/14/02 20 Dublin Core Title Creator Subject Description Publisher Contributors Date Type Format Identifier Source Language Relation Coverage Rights
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Besser--Dublin Core Metadata 2/14/02 21 Dublin Core every element is both optional and repeatable elements are cross-disciplinary elements are extensible by organized communities can employ a syntax such as html’s tagset for use by Spiders and Harvesters May 2000 DLF Metadata Harvesting Project
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Besser--Dublin Core Metadata 2/14/02 22 DC Qualifiers _ allows one community to express important nuances and qualifications, while still making the basic importance available to communities with simple needs _ our community can reflect alternate title, transliterated title, and main title, yet they will all be found under a simple Web search under “title”
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Besser--Dublin Core Metadata 2/14/02 23 Discovery Metadata: Recent History _ Dublin Core (3/95) _ Warwick Framework (4/96) _ Image Metadata Workshop (9/96) _ Canberra, Helsinki,... DC (98) _ Digital Library Collaboratory (97-) _ DC-8, Frankfurt 10/99
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Besser--Dublin Core Metadata 2/14/02 24 Dublin Core--further work _ Warwick Framework – metadata packages for extensible functions – layed groundwork for RDF _ Canberra Qualifiers – refining the semantics of the element set to provide more precise info – SUBELEMENT, SCHEME, LANG _ Granularity – no hierarchical relationships w/i a given DC record; only one record per discrete object (collection or item-level), and relationship field plus qualifier links them
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The Research Process and Functional Categories of Metadata _ Discovery _ Retrieval _ Collation _ Analysis _ Re-presentation
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Besser--Dublin Core Metadata 2/14/02 26 Metadata Mapping- Crosswalks Resource Description Framework (RDF)
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Besser--Dublin Core Metadata 2/14/02 27 Crosswalks mapping btwn differing metadata structures eliminate the need for monolithic, universally adopted standards focus on flexibility and interoperatiblity RDF-based metadata registries
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Besser--Dublin Core Metadata 2/14/02 28 Crosswalk Example
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Besser--Dublin Core Metadata 2/14/02 29 Resource Description Framework (RDF, spec released 2/99) _ W3C Metadata activity _ designed to move the Web beyond simple links to semantically-rich relationships btwn resources _ metadata application using XML as a common syntax for exchange and processing _ flexible architecture for managing diverse application- specific metadata packets that can be processed by machines _ associates resources, property types, and corresponding values _ http://www.w3.org/RDF/
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Besser--Dublin Core Metadata 2/14/02 30 RDF _ Resources (character strings, names, digital objects) _ Property (“is the author of”) _ Value _ resources+properties=relationships _ many different relationships can be reflected
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Besser--Dublin Core Metadata 2/14/02 31 XML-encoded RDF _ _ Howard Besser _
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Besser--Dublin Core Metadata 2/14/02 32 Should you start building with RDF today? _ Tools are primitive _ Standard still likely to evolve
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Besser--Dublin Core Metadata 2/14/02 33 Metadata for Digital Libraries Howard Besser UCLA School of Education & Information Baca, Murtha (ed). Introduction to Metadata, Los Angeles: Getty Information Institute, 1998 http://www.getty.edu/gri/standard/intrometadata/ http://sunsite.Berkeley.EDU/Imaging/Databases/#standards http://sunsite.Berkeley.EDU/moa2/ http://sunsite.Berkeley.EDU/Longevity/ http://www.ifla.org/II/metadata.htm http://purl.oclc.org/metadata/dublin_core/ http://purl.oclc.org/corc/ http://lcweb.loc.gov/ead/ http://www.gseis.ucla.edu/~howard/image-meta.html http://www.gseis.ucla.edu/~howard/Metadata/UC-May00/ http://sunsite.berkeley.edu/Metadata/sp2000.html
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