Pattern Composition

The systematic combination of design patterns to address larger-scale problems, where the interfaces, constraints and intents of the component patterns must be reconciled. Semantic descriptions of agent patterns support tool-assisted composition and consistency checking.

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Architectural Pattern

A reusable, named solution to a recurring system-level design problem, described in terms of components, connectors, and constraints on their composition. Unlike design patterns, architectural patterns govern overall structure and cross-cutting quality attributes such as dependability or scalability.

Summary

The authors propose a fine-grained design language for formalizing and composing agent design patterns, integrated with the PASSI methodology for multi-agent system development. Patterns are represented as semantic networks (Pattern Semantic Description diagrams) whose nodes are Pattern Description Elements - participants, collaborators, events, and actions - typed against a MAS meta-model.

Four composition operators (Unification, Conjunction, Concealing, Externalization) let designers blend patterns systematically, preserving traceability of pattern contributions in the resulting structure. A worked example composes GenericAgent and Request patterns into SequentialShareResource, illustrating how FIPA-Request-compliant service agents can be built through pattern composition.

Key Ideas

PSD diagrams: semantic networks of Participants and Collaborators.

Composition operators: Unification, Conjunction, Concealing, Externalization.

Patterns typed against a MAS meta-model (agent, role, task, communication).

Integrated with PASSI design process.

Worked example of FIPA-Request service pattern composition.

Conceptual Contribution

Claim: Agent design patterns should be formalised as typed semantic networks with explicit composition operators, so that FIPA-compliant systems can be built by pattern algebra rather than ad-hoc composition.

Mechanism: Introduces Pattern Semantic Description (PSD) diagrams typed against a MAS meta-model; defines Unification, Conjunction, Concealing, and Externalization operators; integrates with the PASSI methodology; worked example composes GenericAgent + Request into SequentialShareResource.

Concepts introduced/used: Design Patterns, PASSI Methodology, MAS Meta-model, Pattern Composition, Interaction Protocols, Roles, FIPA-ACL, Agent-Oriented Programming, Ontologies, Multi-Agent Systems

Stance: engineering

Relates to: Supplies a pattern language for the protocol-level conversations tracked by ACRE Agent Conversation Reasoning Engine; its MAS meta-model leans on ontology foundations surveyed in Handbook On Ontologies.

Pattern Composition

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