Typically,
the keywords or topics used in the Subject are harvested from
information in either the Title or Description. Focus on what
the resource
is about, not on a description of the type or format of the resource.
In general, choose the most significant and unique words for
keywords and topics, avoiding those too general to describe a
particular
item.
If the term used in the Subject has variations
or alternative forms, include them as well, even though some
sophisticated Asset
Management Systems have the ability to search a thesaurus of
related terms or suggest possible alternatives.
If the subject of the item is a person or an organization,
use the same form of the name that is used by the element Creator.
Use the element Description when entering free-form
text descriptions of a resource.
PBCore does not recommend a single authority from
which to select keywords, topics and terms. Dozens of authorities,
schemes, and vocabularies
have been developed. Some are useful for assigning general
keywords.
Others are highly specific to certain disciplines, fields
of study, and industries. If you have the interest or expertise
to exploit
such authorities, a short sample list follows. If a particular
authority is used, the specific scheme employed should
be identified
in your metadata. PBCore is considering adding an element,
possibly
named Subject.ClassificationSchemeUsed, in which a specific
subject authority that is used can be identified.
World Wide Web Consortium Thesauri and Controlled
Vocabularies Available for the Choice of Controlled Subject Terms
Library of Congress Authorities
http://authorities.loc.gov/
DDC: Dewey Decimal Classification
IPTC: International Press Telecommunications Council
GEM: Gateway to Educational Materials Subject
Element Controlled Vocabulary
MESH: Medical Subject Headings of the National
Library of Medicine
Getty Art & Architecture Thesaurus
|
Describe
this Element