DCD: Domain-Oriented Design for Controlled Retrieval-Augmented Generation

The article introduces DCD (Domain-Collection-Document), a novel architecture for enhancing Retrieval-Augmented Generation (RAG) systems by structuring knowledge and controlling query processing without altering the underlying language model. DCD employs a hierarchical decomposition of the information space and multi-stage routing to improve retrieval and generation quality, addressing challenges posed by heterogeneous corpora and multi-step queries. Evaluation results demonstrate significant improvements in robustness, factual accuracy, and answer relevance, making DCD a valuable framework for practitioners aiming to optimize RAG implementations.