5. The computer system of claim 3 , wherein the index of the object database includes linkages associating the object record with an abstract record, a full-text record, and a source record from which the object was extracted, and further includes linkages between object records having a same value of a respective type of the predetermined attributes.
5. The computer system of claim 3 , wherein the index of the object database includes linkages associating the object record with an abstract record, a full-text record, and a source record from which the object was extracted, and further includes linkages between object records having a same value of a respective type of the predetermined attributes. 6. The computer system of claim 5 , wherein the linkages are effective to permit other object records, abstract records, and/or full-text records to be retrieved responsively to the search, based on extracted attribute-specific values.