30 lines
1.0 KiB
Markdown
30 lines
1.0 KiB
Markdown
---
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title: RAG L0 Domain Entity Hint
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keywords: [L0 keyword matching, final retrieval result, domain detector, entity extractor, metadata filter]
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summary: Define L0 as a query transformation hint layer instead of final retrieval evidence.
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category: rag
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source: rag-l0-domain-entity-hint
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breadcrumb: RAG > L0 > Domain Entity Hint
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kb_scope: rag-eval
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covers: [l0 hint, query transformation, metadata filter]
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when_to_retrieve: Use when a question asks whether L0 should decide final retrieval or only provide hints.
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---
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# RAG
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## L0
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### Domain Entity Hint
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L0 keyword matching should not decide the final retrieval result.
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In the modular RAG pipeline, L0 behaves like a lightweight domain detector and entity extractor.
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The output can provide:
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1. Candidate domain hints.
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2. Matched entities and keywords.
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3. An optional metadata filter for the first vector retrieval attempt.
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Final evidence still comes from L1 vector retrieval, post-retrieval normalization, rerank, and context packing.
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The important terms are domain detector, entity extractor, and metadata filter.
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