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   This object maps a pair of attributes from two different sources, for example, a table column and a LogicalAttribute, which
            is an internal representation of the column to be used in a mining operation. 
   Superclasses 
   AttributeAssignment 
   References 
   attribute 
   This points to a physical attribute being assigned to a logical attribute. class: Attribute	    defined by: DirectAssignmentRefAttribute
            multiplicity: exactly one inverse: Attribute::directAttrAssignment