If the scheme allows for equally weighted keywords, multiple 4.1 Keyword sub-elements should be used. Users should be able to search for records both by individual keywords and, in hierarchical schemes, by combining keywords from the different levels. In some schemes, the first of a number of equally weighted keywords. To indicate the broadest subject class of the record. To provide a single search entry point.
Users often conduct broad searches when they are unsure of exactly what they are looking for.
It enables them to browse a large number of titles before selecting new search criteria based on the titles brought up by their initial search. Selected from a thesaurus and assigned manually by the creator of the record. Schemes As indicated under element 3. In some schemes, the second of a number of equally weighted keywords. To provide a single search entry point.