The WIA Omni API Standard Guide is the definitive specification for designing unified API gateways that embrace REST, GraphQL, gRPC, WebSocket, and MQTT. By Dr. Yeon Sam-heum, this 276-page reference directly addresses API fragmentation in modern development. It provides the five-layer meta-gateway architecture, omni-request/omni-response schemas, protocol translation matrices, intent interpretation pipelines, and implementation examples in Python, TypeScript, and Bash.