Dublin Core

Mary Jo Chrabasz

LIS 882

Dublin Core Metadata Initiative

Initial roots at 2nd International World Wide Web conference in Chicago, IL in 1994

Workshop to discuss metadata semantics held in 1995

Core set of semantics to categorize web for search & retrieval

Named for Dublin, Ohio where 1995 workshop was held

More conferences and workshops have been held in a number of countries, including England, Australia, Finland, Germany, Canada, Japan, Italy, and the United States

Schema maintained by the Dublin Core Metadata Initiative (DCMI) group

Dublin Core : Basic Elements

The Simple Dublin Core Metadata Element Set (DCMES) consists of 15 metadata elements:

TitleCreatorSubjectDescriptionPublisherContributorDateTypeFormatIdentifierSourceLanguageRelationCoverageRights

Sample Dublin Core Record

DC.Title: A basic doll to knitDC.Creator: Carol MeldrumDC.Subject: KnittingDC.Subject: Knitting PatternsDC.Description: A knitting pattern for a simple doll shape that can be dressed in any way.DC.Type: TextDC.Source: "Excerpted from Knitted Icons: 25 Celebrity Doll Patterns by Carol Meldrum. Copyright 2007 by Collins & Brown. Excerpted with permission from Quick Books."DC.Publisher: Canadian LivingDC.Format: text/htmlDC.Identifier: http://www.canadianliving.com/crafts/knitting/a_basic_doll_to_knit.phpDC.Language: English

Sample Dublin Core record in XML

A basic doll to knitCarol MeldrumKnittingKnitting PatternsA knitting pattern for a simple doll shape that can be dressed in any way.Text"Excerpted from Knitted Icons: 25 Celebrity Doll Patterns by Carol Meldrum. Copyright 2007 by Collins & Brown. Excerpted with permission from Quick Books."Canadian Livingtext/htmlhttp://www.canadianliving.com/crafts/knitting/a_basic_doll_to_knit.phpEnglish

Dublin Core continued

All Dublin Core elements are considered optional and repeatable

There is no prescribed order to the elements nor any required elements

DC can be used with controlled vocabularies but does not require them

Qualified Dublin Core adds to Simple Dublin Core to make elements more specific

Includes additional elements such as Audience, Provenance, and RightsHolder that are not present in Simple Dublin Core

Qualifier should only enhance the element ; the information should still make sense if the qualifier is ignored, according to the "Dumb-Down Principle"

DCMI maintains a small vocabulary for Type

DC expressed using RDF & XML

RDF stands for Resource Description Framework

Is designed to be read and used by machines

Is usually written in XML

Is made of "triples"Subject, predicate, object = triple

Ex: Optimus Prime is a Transformer

Is part of the Semantic Web

Similar to Entity-Relationship models

Early specification of RDF and XML published in 1999 by W3C (World Wide Web Consortium) as a recommendation

A new version published as a set of related specifications in 2004

RDF Triples

DCMI Abstract Model

Provides a reference model against which DC encoding guidelines can be compared

Must be independent of any particular encoding syntax

Allows greater understanding of what we are trying to encode

Facilitates better mappings and translations between syntaxes

Particular encoding guidelines do not need to encode all of the abstract model but DCMI guidelines state that encoding guidelines should refer to the abstract model and indicate which parts are encoded, and which are not

DCMI Resource Model

http://www.ukoln.ac.uk/metadata/dcmi/abstract-model/

DCMI Description Model

Resources

History of the Dublin Core Metadata Initiativehttp://dublincore.org/about/history/

Dublin Core (Wikipedia)http://en.wikipedia.org/wiki/Dublin_Core

DCMI Abstract Model, RDF, Description Model, Description Sethttp://iporter.wordpress.com/2010/02/28/dcmi-abstract-model-rdf-description-model-description-set/

RDF (Wikipedia)http://en.wikipedia.org/wiki/Resource_Description_Framework

Resource Description Framework (RDF): Concepts and Abstract Syntaxhttp://www.w3.org/TR/rdf-concepts/

Expressing Simple Dublin Core in RDF/XMLhttp://dublincore.org/documents/dcmes-xml/

Expressing Qualified Dublin Core in RDF/XMLhttp://dublincore.org/documents/dcq-rdf-xml/

Resources continued

Modelling DC values as resources in RDF http://www.ukoln.ac.uk/metadata/dcmi/rdf-values/

Expressing Dublin Core Metadata using the Resource Description Framework (RDF)http://dublincore.org/documents/dc-rdf/

RDF/XML Syntax Specificationhttp://www.w3.org/TR/REC-rdf-syntax/

DCMI Abstract Modelhttp://www.ukoln.ac.uk/metadata/dcmi/abstract-model/

DCMI Abstract Model (DCMI website)http://dublincore.org/documents/2007/02/05/abstract-model/

What makes the linked data approach differenthttp://dublincore.org/resources/training/NISO_Webinar_20100825/dcmi-webinar-02.pdf

SubjectObject

Predicate

OptimusPrimeTransformer

Is a