dc intro

Introduction to Dublin Core: 

Introduction to Dublin Core

課程目標: 

課程目標 簡述Dublin Core 的發展背景、特性與DC的Element 概述，讓同學對DC有初步的認識 都柏林核心集簡介 都柏林核心集註錄要點 實施(Implement)都柏林核心集簡介 在HTML文件中註錄都柏林核心集

Background: 

Background An attempt to improve resource discovery on the Web Demand for resource discovery Demand for resource description Demand for resource evaluation Now adopted by many resource description communities Museums, libraries, government agencies, and commercial organizations

Primary Goal of Dublin Core: 

Primary Goal of Dublin Core Building an interdisciplinary consensus about a core element set for resource discovery Simplicity of creation and maintenance Semantic Interoperability International Consensus Flexible extensibility Metadata modularity on the Web

Introducing the Dublin Core: 

Introducing the Dublin Core 15 elements of descriptive metadata All elements are optional and repeatable Dublin Core is extensible Offering a starting point for semantically richer descriptions

Dublin Core Element Sets: 

Dublin Core Element Sets Title Creator Subject Description Publisher Contributor Date Type Format Identifier Source Language Relation Coverage Rights

Dublin Core and RDF/XML: 

Dublin Core and RDF/XML Dublin Core is about semantics What we are trying to say about resources RDF is about structure Conventions for encoding the assertions about a resource that uses DC semantics XML Syntax for encoding assertions in RDF RDF-encoded DC metadata

Semantic, Structure, Syntax: 

Semantic, Structure, Syntax

DC in the Real World: 

DC in the Real World DC originally designed with electronic resources in mind Physical resources are fundamentally different Issues of surrogacy become more important Genre, Type, and Format models very greatly Difficult to remember what is being described, and which characteristics of the resource and its surrogates are correct

Introducing Physical Objects: 

Introducing Physical Objects Aspects of the real world are key to much to what museums do Physical objects have dimensions 23 * 46 cm 12 * 52 * 18 in 18.6 cm3 Physical objects have a form Oil on canvas Tadcaster limestone Stainless steel

Introducing Physical Objects: 

Introducing Physical Objects Physical objects change over time Constructed between AD524 and 873 Repaired in AD1270 Incorporated into ornamental arch in AD1320 Physical objects move Cast in Beijing Used in Shanghai Taken to Hong Kong On display in Taipei

Introducing Physical Objects: 

Introducing Physical Objects Physical objects are associated with people Written by William Shakespeare Acquired by Lord Elgin Decreed by the Emperor Hadrian Associated with Prince Charles Edward Stuart Physical objects are contextualized Fired at the Battle of Trafalgar Carried on Apollo 11 from the moon Printed on the first printing press Salvaged from the Titanic

Introducing Collections : 

Introducing Collections Museum objects, whether original or surrogate, are normally part of a collection Collections may be ‘real’ the Sutton Hoo hoard the Chinese Warriors …an aspect of the process by which objects enter the museum… the Burrell Collection Solomon Guggengeim’s art collection … or simply practical Coins at the British Museum the Tate Gallery’s collection of works by Da Vinci

Introducing Surrogacy: 

Introducing Surrogacy Many of the resources we describe are surrogates for something else a Photograph of King Tutankhamen’s death mask a Photograph of a statue of George Washington a film of President Kennedy’s assassination a sound recording of Neil Armstrong’s “One small step for man…” speech on the moon a copy of the Mona Lisa a model of the Great Wall of China a reproduction of the Chinese Warriors

Issues of Surrogacy: 

Issues of Surrogacy Many of the resources we describe are surrogates for something else We need to be clear whether we are describing the resource or its surrogate the sculptor of a statue is often not who person who made its photographic surrogate the model of the Great Wall of China is unlikely to have been created at the same date as the Great Wall of China itself the format of a computer image of the Mona Lisa (image/jpeg ?) is not the same as the format of the original painting (oil on canvas)

1:1 Principle: 

1:1 Principle A discrete resource should have a discrete metadata record Resolve issues over original versus surrogate and item versus collection Associated resources should be linked together by means of the Relation element in DC

1:1 Principle (Cont.): 

1:1 Principle (Cont.) In a record describing a photo of “MOULIN DE LA GALETTE” on a web page Renoir is not the creator of the image The image was not created during the 19 century … but you might include these as Subject terms, and you could usefully provided a link to the record describing the real painting via DC’s Relation element

1:1 Principle (Cont.): 

1:1 Principle (Cont.) Equally, in describing the painting itself http://www.cc…/…/moulin.jpg is not the Identifier of the painting but you might link to this image via Relation, just to show people what the painting looks like.

When should I Use DC: 

When should I Use DC You have a rich standard, need simpler one You want to disclose your data to other communities using commonly understood semantics You want to provide unified access to databases with different underlying schemas You need core description semantics and don’t feel compelled to invent them anew.

Extending Dublin Core: 

Extending Dublin Core Semantic Refinement Modular Approach

Extending DC?: 

Extending DC? <Creator> Paul Paul Inc. ? Paul xyz ? xyz Paul ? <Creator> <fore name> Paul  Paul Inc.  Paul xyz  xyz Paul

Extending DC (Semantic Refinement): 

Extending DC (Semantic Refinement) Improve descriptive precision by adding sub-structure (element qualifier and value qualifier) Creator First Name Surname Affiliation Contact Info.

Extending DC(Modular Approach): 

Extending DC (Modular Approach) Modular extensibility… Additional elements to support local needs Complementary packages of metadata

跨資料庫查詢 (I): 

跨資料庫查詢 (I) Creator Coverage Date Creator Coverage Date Creator Coverage Date

跨資料庫查詢 (II): 

跨資料庫查詢 (II) 人名 地名 年代 人名 地點 時間 主要關係人 次要關係人 關係地區 年代

Element Qualifier: 

Element Qualifier Refine or enhance the meaning of DC by adding qualifiers to DC elements Creator (DC.Creator) Surname (DC.Creator.Surname) Firstname (DC.Creator.Firstname) Date (DC.Date) Created (DC.Date.Created) LastModified (DC.Date.LastModified)

Value Qualifier: 

Value Qualifier Refine or enhance the interpretation of the value Date=1994-05-02 (Scheme=ISO8601) Language=es (Scheme=rfc1766 Subject=Myocardial Infraction; Pericardial Effusion (Scheme=MeSH)