A qualifier that limits one or more of an expression's dimensions to a single member. A QDR is useful when you want to temporarily reference a member without affecting the current selection. For example, suppose you have a Sales measure that is dimensioned by Product, Geography, Channel, and Time. If you select the top ten cities based on Sales, then you should specify which of the members of the Product, Channel, and Time dimensions you want to be considered in the calculation of the top ten cities. A qualified data reference specifies which members of these dimensions to consider.
An object in the BI Beans that represents qualified data references. These objects are used in the QueryBuilder, in rules-based formatting, and in the data retrieval APIs.