The tokenized query, as well as each query alternative generated by spelling suggestion, is expanded by the Oracle Endeca Server based on thesaurus matches. This topic describes the behavior of the thesaurus expansion feature.
Thesaurus expansion replaces each expanded query term with an OR of alternatives.
(pentium OR intel) AND (laptop OR notebook)assuming the match mode is All.
The other match modes (with the exception of Boolean) behave analogously.
If there is a multiple-word thesaurus match, then OR is used on the query itself to accommodate the various ways of partitioning the query terms.
(high AND speed AND (laptop OR notebook)) OR (performance AND (laptop OR notebook))Multiple-word thesaurus matches only apply when the words appear in exact sequence in the query. The queries speed high laptop and high laptop speed do not activate the expansion to performance.
For more details on thesaurus expansion, see the section on this feature.