Natalia Wehler: Dublin Core Requirements on Metadata  multiple softwares to use metadata  management of changing standards  needs to be functional, simple and interoperable  human and machine use

Natalia Wehler: Dublin Core Solutions for Metadata  modularization allows distinct handling of e.g. access, semantics, administration  lead to the idea of the Warwick Framework: containers and packages  internet consists of communities using certain packages in this framework  Dublin Core is one package in this framework

Natalia Wehler: Dublin Core Dublin Core Initiative  Since 1995  creation and refinement of a "core" foundation of property types and values to provide semantic information on WWW resources  to improve searching and indexing on the web  to improve resource discovery on the web (DC system basically applicable on every file/format)  like a library card catalog provides indexes of book properties.

Natalia Wehler: Dublin Core Aims of Dublin Core  metadata has to be simple to create and to maintain e.g. there is only a small number of elements  semantics have to be commonly understandable e.g. basic information is in any case available for “digital tourists”  international application  extensibility e.g. metadata sets for the needs of their communities  applicable to any file/format

Natalia Wehler: Dublin Core Additional Principles  One-to-One-Principle e.g. Not the painter of a digitized image is the creator, but the person who digitized the image  Dumb-down Principle Qualification is only to refine, not to extend the semantic scope of a property  Appropriate values for machine and human reading

Natalia Wehler: Dublin Core Types of DC  Simple (unqualified) Dublin Core consists of fifteen elements  Qualified Dublin Core :  one additional element: audience  qualifiers

Natalia Wehler: Dublin Core Characteristics Simple DC  all elements optional  all elements repeatable  use of the 15 elements of the Dublin Core Metadata Element Set (DCMES)

Natalia Wehler: Dublin Core Dublin Core Metadata Element Set (DCMES)  15 basic metadata elements  documents that only make use of DCMES are called simple DC or unqualified DC  “Pidgin Metadata” 

Natalia Wehler: Dublin Core Example DC in XHTML

Natalia Wehler: Dublin Core Qualified DC Classes of Qualifiers  Element Refinement restricts the scopeof the element  Encoding Scheme helps to interprete a value (for a machine)  07/11/dcmes-qualifiers/