Editing Dublin Core (section)

===Qualified Dublin Core, 2000===

Subsequent to the specification of the original 15 elements, Qualified Dublin Core was developed to provide an extension mechanism to be used when the primary 15 terms were not sufficient. A set of common refinements was provided in the documentation. These schemes include [[Controlled vocabulary|controlled vocabularies]] and formal notations or parsing rules.<ref>{{cite web |url=https://www.dublincore.org/specifications/dublin-core/usageguide/qualifiers/ |title=Using Dublin Core™ - Dublin Core™ Qualifiers |date=2005}}</ref> Qualified Dublin Core was not limited to these specific refinements, allowing communities to create extended metadata terms to meet their needs.<ref name="chan">{{cite book |last1=Chan |first1=Lois Mai |last2=Hodges|first2=Theodora |date=2007 |title=Cataloging and classification : an introduction|edition=Third |publisher=Scarecrow Press}}</ref>

The guiding principle for the qualification of Dublin Core elements, colloquially known as the ''Dumb-Down Principle'',<ref>{{cite web|url=http://www.dublincore.org/usage/documents/principles/|title=DCMI: DCMI Grammatical Principles|website=dublincore.org|access-date=3 April 2018}}</ref> states that an application that does not understand a specific element refinement term should be able to ignore the qualifier and treat the metadata value as if it were an unqualified (broader) element. While this may result in some loss of specificity, the remaining element value (without the qualifier) should continue to be generally correct and useful for discovery.<ref>{{cite web | url=http://dublincore.org/resources/glossary/dumb-down_principle/#:~:text=According%20to%20the%20Dumb-Down,specific%2C%20remain%20correct%20and%20useful | title=Dumb-Down Principle | date=20 November 2012 }}</ref>

Qualified Dublin Core added qualifiers to these elements:

{| class="wikitable"
|+ Qualified Dublin Core Elements
|-
! Element !! Qualifier
|-
|Title||Alternative
|-
|Description||Table Of Contents
|-
|"||Abstract
|-
|DateCreated||Valid
|-
|"||Available
|-
|"||Issued
|-
|"||Modified
|-
|FormatExtent||Medium
|-
|Relation||Is Version Of
|-
|"||Has Version
|-
|"||Is Replaced By
|-
|"||Replaces
|-
|"||Is Required By
|-
|"||Requires
|-
|"||Is Part Of
|-
|"||Has Part
|-
|"||Is Referenced By
|-
|"||References
|-
|"||Is Format Of
|-
|"||Has Format
|-
|Coverage||Spatial
|-
|"||Temporal
|}

And added three elements not in the base 15:
* Audience
* Provenance
* RightsHolder

Qualified Dublin Core is often used with a "dot syntax", with a period separating the element and the qualifier(s). This is shown in this excerpted example provided by Chan and Hodges:<ref name="chan" />

'''Title:''' D-Lib Magazine<br />
'''Title.alternative:''' Digital Library Magazine<br />
'''Identifier.ISSN:''' 1082-9873<br />
'''Publisher:''' Corporation for National Research Initiatives<br />
'''Publisher.place:''' Reston, VA.<br />
'''Subject.topical.LCSH:''' Digital libraries - Periodicals