indicates a parent
descriptor i.e. one level higher in the thesaurus structure. A broader
descriptor is more general. For example Industrial
emissions is the broader term for Industrial
indicates one or more
i.e. one level lower in the thesaurus structure. A narrower descriptor
is more specific. For example Industrial effluents
has narrower terms Solid wastes
and Liquid wastes.
indicates other related
descriptors. For example Industrial effluents is
associated with the descriptor Sewage because
industrial effluents may be discharged into a municipal collection system.
This relation indicates that also other similar terms may be used in describing
an information source.
There may be also links
between descriptors and non-descriptors. The relation UF (Used for) indicates
"synonyms" of a given descriptor.
Note: The non-descriptors should never
be used for describing an information source; they simply provide the descriptor which should be used.