ocr: Figure 2. Agent System Reference Model The overall agent system archi- tecture includes capabilities for naming, communication, and conversation management. Scitwate People Many of these can be imple- keent Agency mented through HITP and XML PpentPlationn features such as XML struc- Apent Coniriaton lonrt other agent tured documents for messages Mararemen Seen Drectoy Facitatar Cani systems using document type definition ntemal Plattam Nessape lansport (DTD), XML schema or uniform resource identifier (URI) for naming, and HITP headers for some of the context.