This file contains the CGI Vocabulary Relation vocabulary, as defined by the IUGS Commission for Geoscience Information (CGI) Geoscience Terminology Working Group. Use National Information Standards Organization (NISO), 2005, Guidelines for the construction, format, and management of monolingual controlled vocabularies: ANSI/NISO Z39.19-2005, Bethesda Md., NISO Press, 184 pages, ISBN: 1-880124-65-3. (accessed at http://www.niso.org/standards/resources/Z39-19-2005.pdf, 6/19/06) for semantic relationships between vocabulary terms, supplemented by Allen and Ferguson (1994) temporal relationships (1 dimensional topology) that are needed to express ordering relationships between time ordinal eras in a time scale or events in an event vocabulary. Narrower term relationship is deprecated in favor of usage of broader term links for hierarchical relationships. This makes searching easier because hierarchy links are always from a narrow (child) term to a broader (parent) terms. By extension, this vocabulary includes all concepts in this conceptScheme, as well as concepts in any previous versions of the scheme.