May 28, 2022 Lowercase Boolean Opeartors No Longer Work

A tweet and Facebook entry from the WorldCat team has announced that Boolean operators will now work ONLY when used in ALL CAPS. Lowercase versions of and, or, not have been added to the word exclusion list.

Here’s an Updated WorldCat Word Exclusion (aka Stop List):

English: a an and (lowercase) are as at be but by for from had have he her his how in is it not (lowercase) of on or (lowercase) that the this to was which with you

French: de la le les des un une

German: der das dass du er sie es wer wie mit am im in aus auf ist sein wird ihr ihre ihres als von mit dich dir mich mir mein sein kein wird

About Gary Price

Gary Price ( is a librarian, writer, consultant, and frequent conference speaker based in the Washington D.C. metro area. Before launching INFOdocket, Price and Shirl Kennedy were the founders and senior editors at ResourceShelf and DocuTicker for 10 years. From 2006-2009 he was Director of Online Information Services at, and is currently a contributing editor at Search Engine Land.