 Each of these three collections is considered as one collection (collectio una), i. e. one of which all the decisions have the same value, even if they appear to contain antinomies.In cases of contradiction, the decisions of the collections of later date invalidate those found in a collection of an earlier date.The "Decretals" of Gregory IX, those of Boniface VIII and the "Clementinæ' are divided uniformly into five books ("liber"), the books into titles ("titulus"), the titles into chapters ("caput"), and treat successively of jurisdiction ("judex"), procedure (judicium), the clergy ("clerus"), marriage ("connubium"), and delinquencies ("crimen").