There are several approaches for information retrieval based on concept lattice, we cite: information retrieval systems for medical documentation (Cole and Eklund, 1996;Cole and Eklund, 1999), software documentation (Linding, 1995;Priss, 2000) and Bioinformatic Databases (Smal-Tabbone et al., 2005).
it separates the conjunction operators from those of disjunction or negation.