10. The system of claim 9 , wherein each of said plurality of entity types is defined to include a corresponding set of attributes, wherein said enabling comprises: identifying the attributes associated with said first entity type and said at least one of said second set of entity types; displaying the identified attributes on said display unit; and receiving from said user respective data values associated with corresponding ones of a desired set of attributes.
14. The system of claim 10 , wherein said set of entity instances of interest are of said first entity type.