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+# CrossER v2 Data Schema
+
+## entities.json
+
+```json
+{
+  "entity_id": "tc2_prod_0001",
+  "source_system": "SAP_TC2",
+  "entity_type": "product",
+  "name": "Maltodextrin DE20 Grade A",
+  "attributes": {
+    "category": "starches",
+    "sub_category": "maltodextrin",
+    "cn_code": "CN 1702.90",
+    "dextrose_equivalent": 20,
+    "grade": "A",
+    "region": "NA",
+    "cost_center": "CC-412",
+    "status": "active"
+  }
+}
+```
+
+### Source Systems
+
+| System | ID Prefix | Naming Style | Completeness |
+|--------|-----------|-------------|-------------|
+| SAP_TC2 | `tc2_` | Formal English | 95% |
+| SAP_CFIN | `cfin_` | Internal codes | 90% |
+| SAP_APAC | `apac_` | Abbreviated | 60% |
+| LEGACY_ERP | `leg_` | Cryptic codes | 45% |
+| SHAREPOINT | `sp_` | Authoritative | 85% |
+
+### Entity Types
+- `product` — Physical products (starches, sugars, acids, proteins, oils)
+- `supplier` — Vendor/supplier companies
+- `tax_code` — Tax classification codes (CN/HS codes)
+- `legal_entity` — Legal entities / subsidiaries
+
+## pairs.json
+
+```json
+{
+  "pair_id": "pair_0001",
+  "entity_a": "tc2_prod_0001",
+  "entity_b": "cfin_prod_0001",
+  "label": "match",
+  "string_similarity": 0.234,
+  "attribute_overlap": 0.500,
+  "difficulty_tier": "hard",
+  "entity_type": "product",
+  "system_pair": ["SAP_CFIN", "SAP_TC2"]
+}
+```
+
+### Labels
+- `match` — Same real-world entity
+- `no_match` — Different entities
+- `ambiguous` — Requires human judgment
+
+### Difficulty Tiers
+- `easy` — String sim >= 0.70
+- `medium` — String sim 0.30-0.70
+- `hard` — String sim < 0.30
+- `adversarial_negative` — High similarity but NOT a match
+- `medium_negative` / `obvious_negative` — No-match tiers
+
+## Splits & Subsets
+
+- `splits/{train,val,test}.json` — 40/20/40 stratified split
+- `subsets/crosser_easy.json` — Easy-tier test pairs
+- `subsets/crosser_hard.json` — Hard + adversarial test pairs
+
+## Oracle Context
+
+- `context/structured/oracle_context.json` — Complete pairwise migration records
+- `context/structured/alias_table.json` — Canonical entity alias groups
+
+## Demo Subset
+
+- `demo/*.csv` — Per-system entity CSVs
+- `demo/ground_truth.csv` — Labeled pairs
+- `demo/rules.yaml` — Business rules
+- `demo/knowledge.yaml` — Domain knowledge artifacts
+
+---
+
+# Extended Pipelines (--pipeline full)
+
+## Email Chains (`email_chains/`)
+
+```json
+// chains.json — array of email threads
+{
+  "chain_id": "email_chain_0001",
+  "domain": "commodity_trading",
+  "messages": [
+    {
+      "message_id": "email_chain_0001_msg_001",
+      "sender": "s.chen@globalfoods.com",
+      "sender_name": "Sarah Chen",
+      "sender_role": "Operations Manager, North America",
+      "recipients": ["j.morrison@globalfoods.com"],
+      "subject": "RE: Is Maltodextrin DE20 Grade A in SAP_TC2 the same as record in SAP_CFIN?",
+      "body": "...",
+      "timestamp": "2025-07-15T09:00:00"
+    }
+  ]
+}
+```
+
+### Email Prediction Format
+
+```json
+[
+  {
+    "chain_id": "email_chain_0001",
+    "extracted_knowledge": [{"type": "entity_mapping", "description": "..."}],
+    "extracted_relationships": [{"type": "discussed_in_context", "entities_involved": 2}],
+    "extracted_corrections": [{"type": "expert_correction", "source_message_ids": ["..."]}]
+  }
+]
+```
+
+## Support Tickets (`tickets/`)
+
+```json
+// tickets.json
+{
+  "ticket_id": "TKT-0001",
+  "domain": "commodity_trading",
+  "title": "Product ID mismatch between SAP_TC2 and SAP_CFIN",
+  "priority": "high",
+  "resolution": {
+    "resolution_type": "entity_mapping",
+    "verdict": "confirmed_match",
+    "confidence": 0.95,
+    "reasoning": "..."
+  },
+  "referenced_precedents": ["TKT-0003"]
+}
+```
+
+### Ticket Prediction Format
+
+```json
+[
+  {
+    "ticket_id": "TKT-0001",
+    "predicted_resolution": "confirmed_match",
+    "referenced_precedent_ids": ["TKT-0003"],
+    "extracted_knowledge": [{"type": "entity_mapping", "description": "..."}]
+  }
+]
+```
+
+## ERP Events (`erp_events/`)
+
+```json
+// events.json
+{
+  "event_id": "EVT-000001",
+  "timestamp": "2025-01-15T10:30:00",
+  "source_system": "SAP_TC2",
+  "event_type": "purchase_order_created",
+  "entity_refs": [
+    {"entity_type": "product", "id": "TC2-1234", "name": "Maltodextrin DE20 Grade A"},
+    {"entity_type": "supplier", "id": "SUP-12345", "name": "Cargill Inc."}
+  ],
+  "attributes": {"amount": 50000.00, "currency": "USD"},
+  "related_events": ["EVT-000002"]
+}
+```
+
+### ERP Prediction Format
+
+```json
+[
+  {
+    "event_id": "EVT-000001",
+    "linked_entity_ids": ["EVT-000002"],
+    "normalized_event_type": "purchase_order_created"
+  }
+]
+```
+
+## Cases (`cases/`)
+
+```json
+// cases.json
+{
+  "case_id": "CASE-0001",
+  "case_type": "entity_disambiguation",
+  "domain": "commodity_trading",
+  "linked_entities": [...],
+  "resolution": {"verdict": "approved", "confidence": 0.9, "evidence": [...]},
+  "cited_precedents": ["CASE-0003"]
+}
+```
+
+### Case Prediction Format
+
+```json
+[
+  {
+    "case_id": "CASE-0001",
+    "predicted_precedent_ids": ["CASE-0003", "CASE-0007"],
+    "predicted_resolution": "approved",
+    "context_entities": ["entity_a", "entity_b"]
+  }
+]
+```
+
+## Corrections (`corrections/`)
+
+```json
+// sequences.json
+{
+  "sequence_id": "CORR-0001",
+  "pattern_id": "entity_mapping_fix",
+  "domain": "commodity_trading",
+  "steps": [
+    {"step_index": 0, "step_type": "system_proposes_mapping", ...},
+    {"step_index": 1, "step_type": "expert_reviews", ...},
+    {"step_index": 2, "step_type": "expert_rejects", ...},
+    {"step_index": 3, "step_type": "expert_provides_correct_mapping", ...}
+  ]
+}
+```
+
+### Correction Prediction Format
+
+```json
+[
+  {
+    "sequence_id": "CORR-0001",
+    "generated_rules": [{"type": "override_mapping", "condition": "...", "action": "..."}],
+    "updated_mappings": [{"entity_a": "...", "entity_b": "...", "is_match": true}]
+  }
+]
+```
+
+## Knowledge Documents (`knowledge_docs/`)
+
+```json
+// manifest.json
+{
+  "doc_id": "KDOC-0001",
+  "filename": "KDOC-0001_concept_commodity_trading.md",
+  "title": "Concept: Dextrose Equivalent and Its Impact on Classification",
+  "doc_type": "concept",
+  "domain": "commodity_trading"
+}
+```
+
+### Knowledge Prediction Format
+
+```json
+[
+  {
+    "doc_id": "KDOC-0001",
+    "extracted_artifacts": [
+      {"type": "concept", "content": "...", "entities": [...], "confidence": 0.95}
+    ]
+  }
+]
+```