(1) A modifier that makes a name unique.
(2) Each component name in a qualified name other than the right-most name. For example, TREE and FRUIT are qualifiers in TREE.FRUIT.APPLE.
(3) A value that provides additional information about a class, association, indication, method, method parameter, instance, property, or reference.
(4) A simple element that gives another generic compound or simple element a specific meaning. Qualifiers are used in mapping single or multiple occurrences. A qualifier can also be used to denote the namespace used to interpret the second part of the name, usually referred to as the ID.
(5) When referring to a QMF object, the part of the name that identifies the owner or the location of an object. When referring to a TSO data set, any part of the name that is separated from the rest of the name by periods. For example, 'TCK', 'XYZ', and 'QUERY' are all qualifiers in the data set name 'TCK.XYZ.QUERY'.