A tool that allows you to combine two or more terms into one search.
There are three Boolean operators: AND, OR, and AND NOT. You can use the Boolean operators to create specific searches composed of seperate concepts.
Sacraments AND baptism- only returns records in which both terms appear
Sacraments OR baptism - returns records in which either term appears, not necessarily both terms
Sacraments AND NOT baptism - only returns records in which sacrament appears and baptism does not appear
Use multiple operators and parantheses to create an order of operations in your search, just like in algebra.
Sacraments AND (marriage OR baptism) - will return records that either contain the terms Sacraments AND marriage or Sacraments AND baptism.
Sacraments AND NOT (marriage OR baptism) - will return records that contain the term Sacraments but do not contain the terms marriage or baptism
You can use as many search terms as you like, as long as you make proper use of operators and parentheses. Remember that if you move the parentheses, or leave them out, you'll get very different results.
(Sacraments AND NOT (marriage OR baptism)) AND (eucharist OR communion)
Visit the Opal Help page for more information on searching, requesting Opal items, and using your account.