When you add terms to the knowledge base, for best results in theme proving, Oracle recommends that you links new terms to one of the categories in the knowledge base.

If you keep new terms separate from existing categories, fewer themes from new terms are proven. The result is poor precision and recall with ABOUT queries, as well as poor quality of gists and theme highlighting.

You link new terms to existing terms by making an existing term the broader term for the new terms.

Consider the example: You purchase a medthes medical thesaurus containing a hierarchy of medical terms. The following are the top four terms in the thesaurus:

• Anesthesia and Analgesia

• Anti-Allergic and Respiratory System Agents

• Anti-Inflammatory Agents, Antirheumatic Agents, and Inflammation Mediators

• Antineoplastic and Immunosuppressive Agents

To map these terms to the existing health and medicine branch in the knowledge base, add the following entries to the medical thesaurus:

health and medicine
 NT Anesthesia and Analgesia
 NT Anti-Allergic and Respiratory System Agents
 NT Anti-Inflamammatory Agents, Antirheumatic Agents, and Inflamation Mediators
 NT Antineoplastic and Immunosuppressive Agents