mla crosswalk

Dublin Core and MARCDublin Core and MARC

MLA BCC 2000-02-25Louisville, KY

Eric Childress

OCLC Online Computer Library Center Inc.

Eric Childress

OCLC Online Computer Library Center Inc.

OutlineOutline

Introduction

Dublin Core

MARC and ISBD/AACR2

Crosswalk principles

Illustrative mapping

CORC’s capabilities

IntroductionIntroduction

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

Lots of Crosswalks….Lots of Crosswalks….

http://www.ukoln.ac.uk/metadata/interoperabilityhttp://www.ukoln.ac.uk/metadata/interoperability

What is Dublin Core?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)

Dublin Core 1.1 Dublin Core 1.1

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

purl.org/dcpurl.org/dc

MARC & ISBD/AACR2MARC & 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

Crosswalk PrinciplesCrosswalk 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

LC’s crosswalk:– http://lcweb.loc.gov/marc/dccross.html

DC to MARC 21 mappingDC 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

MARC view MARC view

Dublin Core viewDublin Core view

Side by Side...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

Resource Description Format viewResource Description Format view

OCLC CORC SystemOCLC 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/corcpurl.oclc.org/corc

CORC’s multiple outputsCORC’s multiple outputs

MARC Auth.Records

MARC Bib.Records

OPAC

1111 OPAC-centered

2222 Gateway-centered

GatewayPathfinders

Dublin CoreMetadata

Questions?Questions?