Dublin Core and MARC

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Dublin Core and MARC

• Eric Childress
• OCLC Online Computer Library Center Inc.

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Outline

• Introduction
• Dublin Core
• MARC and ISBD/AACR2
• Crosswalk principles
• Illustrative mapping
• CORCs capabilities

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Introduction

• What is a crosswalk?
• A specification for mapping one metadata
  standard to another. -- St. Pierre and LaPlant
• Why crosswalk?
• Interoperability
• Expose legacy data
• Expand range of output/format options
• http//www.niso.org/crsswalk.html

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Lots of Crosswalks.
http//www.ukoln.ac.uk/metadata/interoperability
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What is Dublin Core?

• Dublin Core Metadata Element Set
• Designed to support simple resource description,
  discovery and retrieval
• Developed through international consensus process
  
• High potential for worldwide adoption
• Translated into 26 languages (more pending)
• 15 elements -- all optional, all repeatable
• Intended as core -- domains may extend
• Envisioned as a simple lingua franca (crosswalk)

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Dublin Core 1.1

• A core set of DCMI-blessed qualifiers and
  encoding schemes are currently under ballot

purl.org/dc
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MARC ISBD/AACR2

• MARC (ISO 2709)
• Communications protocol for libraries
• National iterations UNIMARC (global)
• MARC 21 Bibliographic, Authorities, Holdings,
  Classification, Community Information
• MARC 21 presumes ISBD-like content rules
• ISBD AACR2
• Prescribes required elements, order,
  repeatability punctuation, expression, source of
  metadata
• Presumes national interpretations
• Extensibility possible, but constrained

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Crosswalk Principles

• General principles guiding OCLC CORC System's
  crosswalk
• Embrace and, if necessary, extend industry
  standards
• Emphasize the predictable and pragmatic
• Engineer for robust performance and ease of
  enhancement
• Expose as much as information content as
  practical in all supported views
• LCs crosswalk
• http//lcweb.loc.gov/marc/dccross.html

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DC to MARC 21 mapping

• Contributor/Creator 700, 710, 711, 720
• Coverage 043, 045, 500, 513, 522, 651, 654
• Date 260 c, 307, 541, 567
• Description 250, 300, 500, 505, 520, 521, 586
• Format 300, 538, 856 q
• Identifier 020, 022, 024, 856
• Language 041, 546
• Publisher 260 b, 700, 710, 711, 720
• Relation 440, 490, 538, 773, 774, 775, 776, 780,
  787 n, 786, 830, 856
• Rights 506, 540, 856
• Source 786, 856
• Subject 050, 082, 090, 092, 600, 610, 611, 650,
  651, 650, 653, 690, 699
• Title 130, 245, 246
• Type 516, 655

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MARC view
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Dublin Core view
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Side by Side...

• 040 No equivalent
• 035 Not mapped
• 092 Subject.DDC.Local
• 245 Title
• 260 a Publisher.Place
• 260 b Publisher
• 270 No equivalent
• 500 Description
• 500 Description
• 516 Not mapped
• 520 Description.Summary
• 540 a Rights
• 540 2 No equivalent
• 650, 4 Subject.LCSH
• 650, 4 Subject.LCSH
• 856 Identifier.URL

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Resource Description Format view
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OCLC CORC System

• Requires only Web-browser for access/use
• Incorporates key international standards
• Metadata Dublin Core, AACR2/MARC
• Characters Unicode, ALA Character Set
• Automates the creation and maintenance of
• Resource records (bibliographic records)
• Including URL management (automation
  cooperation)
• Authority records (established forms of names)
• Pathfinders (Webliographies)
• Offers Web access to DDC
• Integrated with OCLC Cataloging FirstSearch

purl.oclc.org/corc
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CORCs multiple outputs
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Questions?