METADATA VALUE SPACE Almost all metadata standards require

METADATA VALUE SPACE Almost all metadata standards require or recommend the use of controlled vocabularies for some elements.

Revisiting Dublin Core Content data for some elements may be selected from a controlled vocabulary … Content Intellectual Property Instantiation Coverage Contributor Date Description Creator Format Type Publisher Identifier Relation Rights Language Source Subject Title

Metadata Value Space and Controlled Vocabularies Content data for some elements may be selected from a controlled vocabulary: 1) 2) 3) Standardized vocabularies Name authority control Controlled terms

Recommendations from best practices -- Value encoding schemes -- from Dublin Core Metadata Element Set, Version 1. 1

1) Standardized vocabularies Resource Type (DC) http: //dublincore. org/documents/dcmi-type-vocabulary/ Language (ISO) Countries (ISO) http: //www. oasis-open. org/cover/iso 639 a. html http: //www. oasis-open. org/cover/country 3166. html Geographical names (Getty) http: //www. getty. edu/research/tools/vocabulary/tgn/

b) Name authority control The Union List of Artist Names (ULAN) http: //www. getty. edu/research/tools/vocab ulary/ulan/ LC Name Authority file VIAF (a hub of many) http: //viaf. org/ Local name authority files (Create your own)

c) Controlled vocabularies Controlled subject terms LC Subject Headings http: //authorities. loc. gov/ (LCSH available as Linked Data): http: //id. loc. gov/authorities/ Art and Architecture Thesaurus http: //www. getty. edu/research/tools/vocabularies/aat/ (and many thesauri and subject headings lists) http: //www. metadataetc. org/bookwebsite/readings/appendixbencodschemes. htm

Create your controlled lists Compile a list of suggested terms based on dictionaries Extract from available controlled vocabularies E. g. , for object titles (Because objects usually do not bear title information. ) Example: fashion items e. g. , a set of terms for ‘postcard materials’ from AAT “Folk” controlled lists e. g. , GEM Controlled Vocabularies for Audience | Format | Grade | Language | Pedagogy | Relation | Resource Type | Subject

How to construct controlled lists The defining characteristics of a list is that: the terms 1. 2. 3. are all members of the same set or class of items (e. g. , content type, language); are not overlapping in meaning; and are equal in terms of specificity or granularity (e. g. , a geographic areas list does not mix continents with country or state names).

Using Controlled Vocabularies in Metadata Records Example from LOM (Learning Object metadata) 5. 2 Learning Resource Type Explanation: Specific kind of learning object. The most dominant kind shall be first. NOTE: --The vocabulary terms are defined as in the OED: 1989 and as used by educational communities of practice. Value Space: ordered exercise simulation questionnaire diagram figure graph index slide table narrative text exam experiment problem statement self assessment lecture

Build-in a pick list for creating metadata records Source: The J. Paul Getty Museum's implementation of The Museum System software by Gallery Systems

1 controlled values 2 pick list 3 link to lists

IBM Website, embedded metadata

In-Class Exercise Make decisions about value spaces for your metadata project. Point to value standards Create at least one pre-defined term list