Concrete subclasses of this represent a real selection. Selections include things such as 'children of', 'siblings of', 'descendents of' etc.
This class is different from a {@link org.olap4j.metadata.Member} because it represents anabstract member selection (e.g. children of widget' that may not represent any members whereas a Member represents a single member that is known to exist. @author jdixon, jhyde, Luc Boudreau @version $Id: Selection.java 407 2011-03-20 00:44:11Z lucboudreau $ @since May 30, 2007
Basically a subset of the input data is returned based on the evaluation of the expression supplied as selection criteria. @author Andy Clement @author Mark Fisher @author Sam Brannen @since 3.0
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