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Dublin COre

Dublin COre. Ali Alshowaish. Part: 1. History. Collective realization that machine- processability requires a coherent data model A casual discussion at WWW-2 in Chicago, October of 1994 How to make things on the Web easier to find?

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Dublin COre

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  1. Dublin COre Ali Alshowaish Part: 1

  2. History • Collective realization that machine-processability requires a coherent data model • A casual discussion at WWW-2 in Chicago, October of 1994 • How to make things on the Web easier to find? • OCLC & NCSA co-sponsored an invitational workshop in March of 1995 • The workshop became a workshop series, and eventually a conference series • DCMI: Dublin Core Metadata Initiative • Governance and process evolved over time • Unofficial standards maintenance body established

  3. History • 1994: Simple tags to describe Web pages • 1995: The Dublin Core is one of many vocabularies needed ("Warwick Framework") • 1996: The Dublin Core: 13 elements expanded to 15 - appropriate for Text and Images • 1997: “Qualifiers” proposed for specifying meanings • 1998: DCMI involvement in emerging Resource Description Framework (RDF)

  4. History • 2000: Dublin Core Metadata Initiative recommends (approved) qualifiers, broadens its organizational scope beyond the Core • 2001: Workshop Series becomes a conference series • DCMI Affiliates and a board of trustees • 2005: Abstract Model (Finally)

  5. What is Dublin Core? • A simple standard set of metadata elements used primarily to describe digital resources such as video, sound, image, text, and web pages. • It defines resources online in a way that make them easy to find. • Implementations of Dublin Core typically make use of XML and are Resource Description Framework based.

  6. What is Dublin Core? • Dublin Core is defined by ISO in ISO Standard 15836, and NISO Standard Z39.85-2007 • The continuing development of Dublin Core is managed by the Dublin Core Metadata Initiative (DCMI).

  7. Fifteen Core Elements (1996)

  8. Dublin Core with HTML • In HTML there is only one meta tag? And all the Metadata elements have to be inside that tag. • 2 parts for each element (html format) • meta name=" " • content=" " • Because of that all the Dublin Core elements in HTML are attributes. • <meta name="dc.title" content="Sustaining the Environment and Resources for Canadians - What is it?" > • <meta name="dc.creator" content="Government of Canada, Environment Canada, Deputy Minister's Office">

  9. HTML Dublin Core Example <meta name="dc.title"content= "Allergy Alert - Undeclared Sulphites in Al-Durra/Alderra Brand Whole Apricots in Syrup Product "> <meta name="dc.creator"content= "Government of Canada, Canadian Food Inspection Agency, Operations, Office of Food Safety and Recall"> <meta name="dc.subject"content= ”Food safety; Labelling; Food labelling; Consumers; Consumer protection"> <meta name="dc.date"content="2002-01-31"> <meta name="dc.language"content="eng"> <meta name="dc.description"content= "The Canadian Food Inspection Agency (CFIA) is warning consumers with sensitivities to sulphites not to consume AL-Durra/Alderra brand whole apricots in syrup product. This product may contain sulphites which are not declared on the label."> <meta name="dc.publisher"content= Government of Canada, Canadian Food Inspection Agency“>

  10. Dublin Core with XML • In XML each Metadata element has its own tag. • In XML the Dublin Core element are not attributes, but separate elements.

  11. XML Dublin Core Example <dc:title>Jefferson Monument, Louisville, Ky.</dc:title> <dc:description>The Thomas Jefferson monument in Louisville, Kentucky. Jefferson stands upon a pedestal supported by four winged female figures; he holds a partially unrolled scroll. The pedestal, Jefferson's figure and the sky behind the statue are colorized; the base is grey. This monument was given to the city of Louisville by Isaac W. Bernheim. The verso bears a postmark of May 5, 1913.</dc:description> <dc:subject>Monuments &amp; memorials; Jefferson, Thomas,1743-1826--Monuments;</dc:subject> <dc:coverage>Louisville (Ky.)</dc:coverage> <dc:date>1913-03-23</dc:date> <dc:type>Still image</dc:type> <dc:publisher>EarlyAmericanMuseum</dc:publisher> <dc:language>eng</dc:language> <dc:identifier>http://digital.library.universityedu/u?/ulua001,98</dc:identifier>

  12. XML Dublin Core in RDF • RDF: Resource Description Framework. • Input from various communities (several Metadata schemas) • Enables resource description communities to define their own semantics

  13. XML Dublin Core in RDF <?xml version="1.0"?> <rdf:RDFxmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.0/"> <rdf:Descriptionrdf:about="http://www.ukoln.ac.uk/metadata/resources/dc/datamodel/WD-dc-rdf/"> <dc:title> Guidance on expressing the Dublin Core within the Resource Description Framework (RDF) </dc:title> <dc:creator> Eric Miller </dc:creator> <dc:creator> Paul Miller </dc:creator> <dc:creator> Dan Brickley </dc:creator> <dc:subject> Dublin Core; Resource Description Framework; RDF; eXtensibleMarkup Language; XML </dc:subject> <dc:publisher> Dublin Core Metadata Initiative </dc:publisher> <dc:contributor> Dublin Core Data Model Working Group </dc:contributor> <dc:date> 1999-07-01 </dc:date> <dc:format> text/html </dc:format> <dc:language> en </dc:language> </rdf:Description> </rdf:RDF>

  14. Dublin Core Element Set • It consist of 15 elements. • All elements optional • All elements repeatable where appropriate . • It may appear in any order the creator of the metadata wishes. • Extensible (DC Qualifiers) • International in scope, however, DC syntax is not translated

  15. Dublin Core Element Set • The namespace syntax in HTML is like this: dc.title • The namespace syntax in XML is like this: dc:title • Use lower case for DC tags • dc:title • Not: DC:TITLE or Dc:title or Dc:Title

  16. dc:creator • dc.creator indicates who is primarily responsible for creating the content of the resource. • dc.creator example: <meta name="dc.creator" content=“Hamad Aljasser"> <meta name="dc.creator" content="Government of Canada, Department of Canadian Heritage, Parks Canada Agency"> • dc.creator element should reflect organizational hierarchy . • Avoid abbreviations and acronyms • Repeat the creator element to acknowledge important participants.

  17. dc:title • dc.title indicates name given to the resource. • dc.title example: • <meta name="dc.title" content=“American Rural Information Service "> • If the resource described is a website, Ideally, the content for <dc.title> should be identical to the HTML <title> </title>

  18. dc:language • dc:language indicates the language of the intellectual content of the resource. • dc.language examples: • <meta name="dc.language“ content="eng"> • <meta name="dc.language” content="fre"> • Since the field is repeatable, it may describe documents in many languages. • Language names should be described in some standard encoding scheme such as ISO639.

  19. dc:date • dc.date indicates a date associated with a resource. • dc.date examples: <meta name="dc.date" content="2002-04-16"> <meta name=”dc.date” content=”2003-02-20”> • Format is YYYY-MM-DD (e.g. 2003-03-15) • Fill in unknown year with “?” (e.g. 199?-01-01) • Fill in unknown month and day with 01 (e.g. 1995-01-01)

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