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+# PR #39984 Review: Added hierarchy in Purview Unified Catalog
+
+## Executive Summary
+
+This PR refactors the Purview Unified Catalog TypeSpec specification by organizing operations into TypeSpec interfaces, updating operation naming conventions, and adding new functionality. The changes include both **breaking changes** and **non-breaking additions** to the REST API.
+
+**Key Finding**: This PR contains **BREAKING CHANGES** to the REST API through operation ID renames, which will affect SDK clients.
+
+---
+
+## 1. Overview of Changes
+
+### 1.1 Files Changed
+- **TypeSpec Source Files**: 5 files modified
+  - `client.tsp`: Removed commented-out client customizations (cleanup)
+  - `main.tsp`: Added documentation to endpoint parameter
+  - `models.tsp`: Enhanced documentation and added new properties
+  - `routes.tsp`: Major refactoring - operations organized into interfaces
+- **Generated OpenAPI**: 1 file modified
+- **Example Files**: 211 files (renamed/moved/added) to align with new operation naming
+
+### 1.2 Commit Message
+"Added hierarchy in Purview Unified Catalog"
+
+---
+
+## 2. REST API Changes Analysis
+
+### 2.1 **BREAKING CHANGES** ⚠️
+
+#### 2.1.1 Operation ID Renames (Breaking)
+
+All operation IDs have been renamed to follow the pattern `{Interface}_{Operation}`:
+
+| Old Operation ID | New Operation ID | HTTP Method | Path |
+|-----------------|------------------|-------------|------|
+| `EnumerateDomains` | `BusinessDomain_Enumerate` | GET | `/domains` |
+| `CreateDomain` | `BusinessDomain_Create` | POST | `/domains` |
+| `GetDomainById` | `BusinessDomain_Get` | GET | `/domains/{domainId}` |
+| `UpdateDomain` | `BusinessDomain_Update` | PUT | `/domains/{domainId}` |
+| `DeleteDomainById` | `BusinessDomain_Delete` | DELETE | `/domains/{domainId}` |
+| `ListCriticalDataElement` | `CriticalDataElements_List` | GET | `/criticalDataElements` |
+| `CreateCriticalDataElement` | `CriticalDataElements_Create` | POST | `/criticalDataElements` |
+| `GetCriticalDataElementById` | `CriticalDataElements_Get` | GET | `/criticalDataElements/{id}` |
+| `UpdateCriticalDataElement` | `CriticalDataElements_Update` | PUT | `/criticalDataElements/{id}` |
+| `DeleteCriticalDataElementById` | `CriticalDataElements_Delete` | DELETE | `/criticalDataElements/{id}` |
+| `ListCriticalDataElementRelationships` | `CriticalDataElements_ListRelationships` | GET | `/criticalDataElements/{id}/relationships` |
+| `CreateCriticalDataElementRelationship` | `CriticalDataElements_CreateRelationship` | POST | `/criticalDataElements/{id}/relationships` |
+| `DeleteCriticalDataElementRelationship` | `CriticalDataElements_DeleteRelationship` | DELETE | `/criticalDataElements/{id}/relationships` |
+| `GetCriticalDataElementFacets` | `CriticalDataElements_GetFacets` | POST | `/criticalDataElements/facets` |
+| `QueryCriticalDataElements` | `CriticalDataElements_Query` | POST | `/criticalDataElements/query` |
+| `ListDataProducts` | `DataProducts_List` | GET | `/dataProducts` |
+| `CreateDataProduct` | `DataProducts_Create` | POST | `/dataProducts` |
+| `GetDataProductById` | `DataProducts_Get` | GET | `/dataProducts/{id}` |
+| `UpdateDataProduct` | `DataProducts_Update` | PUT | `/dataProducts/{id}` |
+| `DeleteDataProductById` | `DataProducts_Delete` | DELETE | `/dataProducts/{id}` |
+| `ListDataProductRelationships` | `DataProducts_ListRelationships` | GET | `/dataProducts/{id}/relationships` |
+| `CreateDataProductRelationship` | `DataProducts_CreateRelationship` | POST | `/dataProducts/{id}/relationships` |
+| `DeleteDataProductRelationship` | `DataProducts_DeleteRelationship` | DELETE | `/dataProducts/{id}/relationships` |
+| `GetDataProductFacets` | `DataProducts_GetFacets` | POST | `/dataProducts/facets` |
+| `QueryDataProducts` | `DataProducts_Query` | POST | `/dataProducts/query` |
+| `CreateTerm` | `Terms_Create` | POST | `/terms` |
+| `ListTerm` | `Terms_List` | GET | `/terms` |
+| `GetTerm` | `Terms_Get` | GET | `/terms/{id}` |
+| `UpdateTerm` | `Terms_Update` | PUT | `/terms/{id}` |
+| `DeleteTerm` | `Terms_Delete` | DELETE | `/terms/{id}` |
+| `QueryTerms` | `Terms_Query` | POST | `/terms/query` |
+| `GetTermFacets` | `Terms_GetFacets` | POST | `/terms/facets` |
+| `ListHierarchyTerms` | `Terms_ListHierarchy` | GET | `/terms/{id}/hierarchy` |
+| `AddRelatedEntity` | `Terms_AddRelatedEntity` | POST | `/terms/{id}/relatedEntities` |
+| `DeleteRelatedTerm` | `Terms_DeleteRelated` | DELETE | `/terms/{id}/relatedEntities/{entityId}` |
+| `ListRelatedEntities` | `Terms_ListRelatedEntities` | GET | `/terms/{id}/relatedEntities` |
+| `ListObjectives` | `Okr_List` | GET | `/objectives` |
+| `CreateObjective` | `Okr_Create` | POST | `/objectives` |
+| `QueryObjectives` | `Okr_Query` | POST | `/objectives/query` |
+| `GetObjectiveFacets` | `Okr_GetFacets` | POST | `/objectives/facets` |
+| `GetObjectiveById` | `Okr_Get` | GET | `/objectives/{id}` |
+| `UpdateObjective` | `Okr_Update` | PUT | `/objectives/{id}` |
+| `DeleteObjectiveById` | `Okr_Delete` | DELETE | `/objectives/{id}` |
+| `ListKeyResults` | `Okr_ListKeyResults` | GET | `/objectives/{id}/keyResults` |
+| `CreateKeyResult` | `Okr_CreateKeyResult` | POST | `/objectives/{id}/keyResults` |
+| `GetKeyResultById` | `Okr_GetKeyResult` | GET | `/objectives/{id}/keyResults/{keyResultId}` |
+| `UpdateKeyResult` | `Okr_UpdateKeyResult` | PUT | `/objectives/{id}/keyResults/{keyResultId}` |
+| `DeleteKeyResultById` | `Okr_DeleteKeyResult` | DELETE | `/objectives/{id}/keyResults/{keyResultId}` |
+| `ListPolicies` | `Policies_List` | GET | `/policies` |
+| `UpdatePolicy` | `Policies_Update` | PUT | `/policies/{policyId}` |
+
+**Impact**: 
+- Existing SDK clients using these operation IDs will break
+- Generated SDKs will have different method names
+- API documentation and client code will need to be updated
+
+#### 2.1.2 API Version Status
+- API Version: `2025-09-15-preview` (Preview version)
+- Since this is a **preview** API version, breaking changes are typically acceptable according to Azure API Guidelines
+
+---
+
+### 2.2 **NON-BREAKING ADDITIONS** ✅
+
+#### 2.2.1 New Model Properties
+
+**DataAssetQueryRequest** (models.tsp lines 495-496):
+```typescript
+@doc("includingOrphans true or false")
+includingOrphans?: boolean;
+```
+- **Assessment**: Non-breaking addition - optional property
+
+**ObjectiveQueryRequest** (models.tsp lines 1242-1243):
+```typescript
+@doc("To filter by managed attributes.")
+managedAttributes?: SharedSearchManageAttributeSearchFilter[];
+```
+- **Assessment**: Non-breaking addition - optional property
+
+#### 2.2.2 Enhanced Documentation
+
+**SharedSearchManageAttributeSearchFilter** properties now have examples:
+- `field`: Added example "Example: 'All Attributes Types.AttributeName'"
+- `operator`: Added example "Example: 'ne' , 'eq' ,'gt' , 'ge' , 'lt' , 'le', 'contains' ,'notcontains', 'prefix','eq-any'"
+- `value`: Added example "Example: '2', 'LAST_24H', LAST_7D','LAST_30D',LAST_365D','MORE_THAN_365D'"
+- `type`: Added example "Example: 'int','date','double','float',richtext','short','string','boolean','multiChoice'"
+
+**main.tsp** endpoint parameter:
+- Added: `@doc("The endpoint of the Purview Unified Catalog service. Example: https://api.purview-service.microsoft.com/")`
+
+---
+
+### 2.3 TypeSpec Structural Changes (Non-Breaking to REST API)
+
+#### 2.3.1 Interface Organization
+Operations have been organized into TypeSpec interfaces:
+- `interface CriticalDataElements { ... }`
+- `interface DataProducts { ... }`
+- `interface BusinessDomain { ... }`
+- `interface Terms { ... }`
+- `interface Okr { ... }`
+- `interface Policies { ... }`
+
+**Assessment**: This is a TypeSpec-level refactoring that improves code organization. The generated OpenAPI structure remains the same (same paths, methods, parameters).
+
+#### 2.3.2 Operation Name Simplification
+Within interfaces, operation names have been simplified:
+- Old: `op ListCriticalDataElement is ...`
+- New: `op List is ...` (within `interface CriticalDataElements`)
+
+**Assessment**: Non-breaking - the OpenAPI operation IDs are set by the interface name + operation name combination.
+
+#### 2.3.3 Client Customization Cleanup
+Removed commented-out `@@clientName` decorators from `client.tsp`.
+
+**Assessment**: Non-breaking - these were already commented out and not in effect.
+
+---
+
+## 3. Compliance with Azure API Guidelines
+
+### 3.1 Conformance ✅
+
+#### 3.1.1 Operation ID Naming Pattern
+- **Guideline**: Operation IDs should follow the pattern `{ResourceType}_{Action}`
+- **Status**: ✅ **COMPLIANT** - The new operation IDs follow this pattern (e.g., `CriticalDataElements_List`, `DataProducts_Create`)
+
+#### 3.1.2 Documentation
+- **Guideline**: All operations, parameters, and models must have clear descriptions
+- **Status**: ✅ **COMPLIANT** - Documentation has been maintained and enhanced with examples
+
+#### 3.1.3 Versioning
+- **Guideline**: API version format should be YYYY-MM-DD or YYYY-MM-DD-preview
+- **Status**: ✅ **COMPLIANT** - Uses `2025-09-15-preview`
+
+#### 3.1.4 Security
+- **Guideline**: Security definitions (OAuth2) must be present
+- **Status**: ✅ **COMPLIANT** - `@useAuth(AuthToken)` with OAuth2 is defined in main.tsp
+
+#### 3.1.5 HTTP Methods
+- **Guideline**: Use standard HTTP verbs appropriately
+- **Status**: ✅ **COMPLIANT** - GET for reads, POST for creates/queries, PUT for updates, DELETE for deletes
+
+### 3.2 Breaking Changes Policy
+
+#### 3.2.1 Preview API Versions
+- **Guideline**: Breaking changes are allowed in preview API versions
+- **Status**: ✅ **ACCEPTABLE** - This is a preview version (`2025-09-15-preview`)
+- **Recommendation**: Document the breaking changes clearly in release notes
+
+#### 3.2.2 Stable API Versions
+- **Guideline**: No breaking changes allowed in stable API versions
+- **Status**: N/A - This is a preview version
+
+---
+
+## 4. Data Plane API Specific Considerations
+
+### 4.1 Data Plane Characteristics ✅
+- Uses OAuth2 authentication ✅
+- Does not use ARM resource provider patterns ✅
+- Operations are scoped to data management, not resource management ✅
+- Uses `@server` decorator with custom endpoint ✅
+
+### 4.2 Naming Conventions ✅
+- Properties use camelCase ✅
+- Operations use PascalCase within interface ✅
+- Generated operation IDs use underscore separator ✅
+
+---
+
+## 5. TypeSpec Best Practices Review
+
+### 5.1 Strengths ✅
+1. **Interface Organization**: Grouping related operations into interfaces improves maintainability
+2. **Documentation Examples**: Adding concrete examples to documentation helps developers
+3. **Consistent Patterns**: All interfaces follow the same structural pattern
+4. **Suppression Decorators**: Properly documented reasons for suppressing linter rules
+
+### 5.2 Areas for Consideration
+1. **Migration Path**: Consider providing operation ID aliases for backward compatibility during a transition period
+2. **Changelog**: Ensure comprehensive changelog documenting the operation ID changes
+3. **SDK Impact**: Coordinate with SDK teams to ensure smooth transition
+
+---
+
+## 6. New Functionality
+
+### 6.1 Example Files Suggest New Operations
+Based on example file names, there appear to be new "Count" operations:
+- `CriticalDataElements_Count_Gen.json`
+- `DataProducts_Count_Gen.json`
+- `Okr_Count_Gen.json`
+- `Terms_Count_Gen.json`
+
+**Assessment**: These examples exist but the corresponding operations may not be fully implemented in the TypeSpec or OpenAPI yet. Needs verification.
+
+### 6.2 New Policy Examples
+New policy example files have been added:
+- `Policies_Update_DataGovernanceApp_Gen.json`
+- `Policies_Update_DgDataQualityScope_Gen.json`
+
+**Assessment**: Suggests expanded policy functionality.
+
+---
+
+## 7. Recommendations
+
+### 7.1 For PR Approval
+
+#### High Priority
+1. ⚠️ **Document Breaking Changes**: Add a clear section to the PR description listing all operation ID changes
+2. ⚠️ **SDK Coordination**: Ensure SDK teams are aware of the breaking changes and have updated their generators
+3. ⚠️ **Changelog**: Create or update CHANGELOG.md to document these breaking changes
+4. ⚠️ **Migration Guide**: Consider providing a migration guide for existing clients
+
+#### Medium Priority
+5. 📝 **Verify Count Operations**: Confirm if Count operations are intended to be added and ensure they're properly implemented
+6. 📝 **Example File Consistency**: Verify all renamed example files correctly reference the new operation IDs
+7. 📝 **Test Coverage**: Ensure test coverage for all renamed operations and new properties
+
+#### Low Priority
+8. ✨ **Release Notes**: Prepare release notes highlighting the improved organization and new features
+9. ✨ **API Documentation**: Update any external API documentation to reflect new operation names
+
+### 7.2 For Future PRs
+1. Consider using `@added`, `@removed`, or `@renamedFrom` decorators to track API evolution
+2. For stable API versions, avoid operation ID changes - use client customizations instead
+3. Consider implementing semantic versioning for the TypeSpec modules themselves
+
+---
+
+## 8. Conclusion
+
+### 8.1 Summary
+This PR makes significant structural improvements to the Purview Unified Catalog TypeSpec specification by organizing operations into logical interfaces and standardizing naming conventions. The changes result in **breaking changes to operation IDs** in the generated REST API.
+
+### 8.2 Verdict
+- **TypeSpec Quality**: ✅ **Excellent** - Well-structured refactoring with clear patterns
+- **API Guidelines Compliance**: ✅ **Compliant** - Follows Azure API guidelines for data-plane APIs
+- **Breaking Changes**: ⚠️ **Present but Acceptable** - Breaking changes are present, but acceptable for preview API version
+- **Overall Recommendation**: ✅ **APPROVE with conditions**
+
+### 8.3 Approval Conditions
+1. Add comprehensive documentation of breaking changes to PR description
+2. Confirm coordination with SDK teams
+3. Verify Count operations are intentional and properly implemented
+4. Update CHANGELOG.md
+
+---
+
+## 9. Detailed Change Log
+
+### Added
+- New optional property `includingOrphans` in `DataAssetQueryRequest` model
+- New optional property `managedAttributes` in `ObjectiveQueryRequest` model
+- Enhanced documentation with examples for `SharedSearchManageAttributeSearchFilter` properties
+- Documentation for endpoint parameter in main.tsp
+- Example files for Count operations (CriticalDataElements, DataProducts, Okr, Terms)
+- New policy example files
+
+### Changed
+- All operation IDs renamed to follow `{Interface}_{Operation}` pattern
+- Operations organized into TypeSpec interfaces (CriticalDataElements, DataProducts, BusinessDomain, Terms, Okr, Policies)
+- 211 example files renamed to match new operation naming convention
+
+### Removed
+- Commented-out client customizations from client.tsp
+
+---
+
+## Appendix A: Files Modified
+
+**TypeSpec Source Files:**
+- `specification/purviewdatagovernance/Azure.Analytics.Purview.UnifiedCatalog/client.tsp`
+- `specification/purviewdatagovernance/Azure.Analytics.Purview.UnifiedCatalog/main.tsp`
+- `specification/purviewdatagovernance/Azure.Analytics.Purview.UnifiedCatalog/models.tsp`
+- `specification/purviewdatagovernance/Azure.Analytics.Purview.UnifiedCatalog/routes.tsp`
+
+**Generated OpenAPI:**
+- `specification/purviewdatagovernance/data-plane/Azure.Analytics.Purview.UnifiedCatalog/preview/2025-09-15-preview/CatalogApiService.json`
+
+**Example Files:** 211 files (renamed/moved/added)
+
+---
+
+**Review Date:** 2026-02-02  
+**Reviewer:** GitHub Copilot  
+**API Guidelines Version:** https://github.com/microsoft/api-guidelines/blob/vNext/azure/Guidelines.md
diff --git a/REFINED_REVIEW.md b/REFINED_REVIEW.md
new file mode 100644
index 000000000000..201aeafb00d0
--- /dev/null
+++ b/REFINED_REVIEW.md
@@ -0,0 +1,312 @@
+# Refined PR #39984 Review - Focus on REST API Caller Impact
+
+## 🎯 Primary Question: Are there REST API changes that affect callers?
+
+### ✅ **YES** - But they are **MINIMAL and NON-BREAKING**
+
+---
+
+## Critical Distinction
+
+When evaluating REST API changes, we must distinguish between:
+
+1. **REST API Changes** = Changes that affect HTTP requests/responses (paths, methods, schemas, parameters)
+2. **OpenAPI Metadata Changes** = Changes that don't affect HTTP calls (operationId, descriptions, x-* extensions)
+
+---
+
+## 📊 Analysis: What Changed?
+
+### 🟢 **ACTUAL REST API CHANGES** (What Affects HTTP Callers)
+
+#### 1. New Optional Query/Request Properties ✅ NON-BREAKING
+
+**DataAssetQueryRequest** - New optional property in request body:
+```json
+POST /dataAssets/query
+{
+  "includingOrphans": true  // NEW: optional boolean
+}
+```
+- **Type**: Optional request body property
+- **Breaking?**: NO - Optional properties are non-breaking
+- **Impact**: Callers can optionally use this new filter
+
+**ObjectiveQueryRequest** - New optional property in request body:
+```json
+POST /objectives/query  
+{
+  "managedAttributes": [...]  // NEW: optional array
+}
+```
+- **Type**: Optional request body property
+- **Breaking?**: NO - Optional properties are non-breaking
+- **Impact**: Callers can optionally filter by managed attributes
+
+#### 2. Enhanced Documentation ✅ NON-BREAKING
+
+**SharedSearchManageAttributeSearchFilter** properties now include examples:
+- `field`: "Example: 'All Attributes Types.AttributeName'"
+- `operator`: "Example: 'ne', 'eq', 'gt', 'ge', 'lt', 'le', 'contains', 'notcontains', 'prefix', 'eq-any'"
+- `value`: "Example: '2', 'LAST_24H', 'LAST_7D', 'LAST_30D', 'LAST_365D', 'MORE_THAN_365D'"
+- `type`: "Example: 'int', 'date', 'double', 'float', 'richtext', 'short', 'string', 'boolean', 'multiChoice'"
+
+- **Type**: Documentation enhancement
+- **Breaking?**: NO - Doesn't change wire format
+- **Impact**: Better developer experience
+
+---
+
+### 🔵 **OPENAPI METADATA CHANGES** (What Does NOT Affect HTTP Callers)
+
+#### Operation ID Renames ⚠️ SDK Breaking, NOT REST API Breaking
+
+**All operation IDs renamed** (50+ operations):
+
+```
+Old: ListCriticalDataElement    → New: CriticalDataElements_List
+Old: CreateDomain              → New: BusinessDomain_Create
+Old: QueryObjectives           → New: Okr_Query
+```
+
+**HTTP-Level Impact:**
+- ❌ **NO change to HTTP paths** (still `/criticalDataElements`, `/domains`, etc.)
+- ❌ **NO change to HTTP methods** (still GET, POST, PUT, DELETE)
+- ❌ **NO change to request/response schemas**
+- ❌ **NO change to query parameters**
+- ❌ **NO change to headers**
+
+**What IS Affected:**
+- ✅ **SDK method names** will change (e.g., `client.ListCriticalDataElement()` → `client.CriticalDataElements.List()`)
+- ✅ **Generated client structure** will be different
+- ✅ **API documentation references** need updates
+
+**Analogy:**
+Think of operationId like a function name in documentation. If you're calling the REST API directly with HTTP:
+```bash
+# This HTTP call works EXACTLY THE SAME before and after:
+curl -X GET "https://api.purview.../criticalDataElements" \
+  -H "Authorization: Bearer $TOKEN"
+```
+
+The operationId change only affects:
+- OpenAPI tooling that generates code from the spec
+- Documentation that references these operation IDs
+- SDK clients generated from the spec
+
+---
+
+## 📋 Compliance with Azure API Guidelines
+
+### ✅ REST API Caller Perspective
+
+**What Matters to API Callers:**
+- ✅ **No breaking changes to HTTP interface**
+- ✅ **New optional features added (non-breaking)**
+- ✅ **Documentation improved**
+- ✅ **API version unchanged** (`2025-09-15-preview`)
+
+**Azure Breaking Changes Policy:**
+From [Azure Breaking Changes Policy](https://aka.ms/AzBreakingChangesPolicy):
+> Breaking changes include:
+> - Removing or renaming APIs or parameters
+> - **Changing API behavior**
+> - **Adding required parameters**
+> - **Reducing the set of possible return values**
+
+This PR:
+- ❌ Does NOT remove/rename APIs (HTTP paths/methods unchanged)
+- ❌ Does NOT change API behavior (same responses)
+- ❌ Does NOT add required parameters (new properties are optional)
+- ❌ Does NOT reduce return values (no properties removed)
+
+---
+
+## 🎓 TypeSpec Knowledge: Understanding the Refactoring
+
+### What Changed in TypeSpec Structure
+
+**Before:** Flat operation structure
+```typescript
+namespace PurviewUnifiedCatalog;
+
+op ListCriticalDataElement is ...
+op CreateCriticalDataElement is ...
+op GetCriticalDataElementById is ...
+```
+
+**After:** Interface-grouped operations
+```typescript
+namespace PurviewUnifiedCatalog;
+
+interface CriticalDataElements {
+  List is ...    // HTTP: GET /criticalDataElements
+  Create is ...  // HTTP: POST /criticalDataElements
+  Get is ...     // HTTP: GET /criticalDataElements/{id}
+}
+```
+
+### How TypeSpec Generates Operation IDs
+
+TypeSpec combines the interface name and operation name:
+- Interface: `CriticalDataElements`
+- Operation: `List`
+- **Generated operationId**: `CriticalDataElements_List`
+
+### Why This Refactoring Is Good
+
+1. **Better Code Organization**: Related operations grouped together
+2. **Clearer SDK Structure**: Generates client like `client.CriticalDataElements.List()`
+3. **Azure Guidelines Compliance**: Follows `{Resource}_{Action}` pattern
+4. **Maintainability**: Easier to find and update related operations
+
+### HTTP-Level Impact: ZERO
+
+The generated OpenAPI still produces:
+```json
+{
+  "paths": {
+    "/criticalDataElements": {
+      "get": {
+        "operationId": "CriticalDataElements_List",  // <-- Only this changed
+        "parameters": [...],  // <-- Same
+        "responses": {...}    // <-- Same
+      }
+    }
+  }
+}
+```
+
+---
+
+## 🚦 Updated Recommendation
+
+### **For REST API Callers: NO BREAKING CHANGES** ✅
+
+If you're calling the API directly via HTTP (curl, fetch, HttpClient, etc.):
+- ✅ All existing HTTP calls continue to work
+- ✅ No code changes required
+- ✅ Optionally adopt new query filters
+
+### **For SDK Users: SDK Breaking Changes** ⚠️
+
+If you're using generated SDKs:
+- ⚠️ Method names will change
+- ⚠️ Client structure will change
+- ⚠️ Need to update SDK references
+
+### **Approval Status**
+
+**APPROVE** ✅
+
+**Justification:**
+1. **REST API**: No breaking changes to HTTP interface
+2. **New Features**: Non-breaking additions (optional properties)
+3. **SDK Changes**: Acceptable for preview API version
+4. **Guidelines**: Improved compliance with Azure guidelines
+5. **Code Quality**: Better organized and maintainable
+
+**Required Actions:**
+1. 📝 Clarify in PR description: "operationId changes only affect SDK, not REST API callers"
+2. 📝 Document SDK migration guide for preview users
+3. 📝 Update CHANGELOG.md with distinction between REST API and SDK changes
+
+---
+
+## 📊 Impact Summary Table
+
+| Change Type | REST API Caller | SDK User | OpenAPI Tooling |
+|------------|----------------|----------|-----------------|
+| HTTP Paths | ✅ No Impact | ✅ No Impact | ✅ No Impact |
+| HTTP Methods | ✅ No Impact | ✅ No Impact | ✅ No Impact |
+| Request Schemas | 🟢 New Optional Props | 🟢 New Optional Props | 🟢 New Props |
+| Response Schemas | ✅ No Impact | ✅ No Impact | ✅ No Impact |
+| Operation IDs | ✅ No Impact | ⚠️ Method Names Change | ⚠️ Changes |
+| Documentation | 🟢 Improved | 🟢 Improved | 🟢 Improved |
+
+Legend:
+- ✅ No Impact = No changes
+- 🟢 Non-Breaking = Backward compatible additions
+- ⚠️ Breaking = Requires code updates
+
+---
+
+## 📖 Example: Before and After
+
+### REST API Caller (curl/HTTP) - NO CHANGES NEEDED
+
+**Before PR:**
+```bash
+# List critical data elements
+curl -X GET \
+  "https://api.purview.../criticalDataElements?keyword=test" \
+  -H "Authorization: Bearer $TOKEN"
+
+# Query data assets
+curl -X POST \
+  "https://api.purview.../dataAssets/query" \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{"nameKeyword": "test"}'
+```
+
+**After PR:**
+```bash
+# List critical data elements - WORKS EXACTLY THE SAME
+curl -X GET \
+  "https://api.purview.../criticalDataElements?keyword=test" \
+  -H "Authorization: Bearer $TOKEN"
+
+# Query data assets - CAN USE NEW OPTIONAL PROPERTY
+curl -X POST \
+  "https://api.purview.../dataAssets/query" \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "nameKeyword": "test",
+    "includingOrphans": true  // NEW: Optional
+  }'
+```
+
+### SDK User (Generated Client) - NEEDS UPDATES
+
+**Before PR (TypeScript SDK example):**
+```typescript
+// Old SDK structure
+const result = await client.listCriticalDataElement({
+  keyword: "test"
+});
+```
+
+**After PR (TypeScript SDK example):**
+```typescript
+// New SDK structure - method name and structure changed
+const result = await client.criticalDataElements.list({
+  keyword: "test"
+});
+```
+
+---
+
+## 🎯 Conclusion
+
+### REST API Perspective
+**NO BREAKING CHANGES** - All HTTP endpoints work exactly as before, with optional enhancements.
+
+### SDK Perspective  
+**BREAKING CHANGES** - Method names and client structure will change in generated SDKs.
+
+### Overall Assessment
+This is a **high-quality refactoring** that:
+- ✅ Improves code organization
+- ✅ Follows Azure guidelines
+- ✅ Maintains REST API compatibility
+- ✅ Adds useful optional features
+- ⚠️ Requires SDK regeneration (acceptable for preview)
+
+---
+
+**Review Date:** 2026-02-02  
+**Reviewer:** GitHub Copilot  
+**Focus:** REST API Caller Impact vs OpenAPI Metadata  
+**Verdict:** ✅ APPROVE - No breaking REST API changes
diff --git a/REVIEW_SUMMARY.md b/REVIEW_SUMMARY.md
new file mode 100644
index 000000000000..955d8568a243
--- /dev/null
+++ b/REVIEW_SUMMARY.md
@@ -0,0 +1,198 @@
+# Quick Review Summary - PR #39984
+
+## 🎯 Primary Question: Are there REST API changes that affect callers?
+
+### ✅ **YES** - But they are **MINIMAL and NON-BREAKING**
+
+**Important Distinction:**
+- **REST API Changes** = Changes to HTTP paths/methods/schemas (affects API callers)
+- **OpenAPI Metadata** = Changes to operationId/descriptions (affects SDK generation only)
+
+---
+
+## 📊 Change Classification
+
+### 🟢 **REST API CHANGES** (Non-Breaking Additions)
+
+**New Optional Request Properties:**
+- `DataAssetQueryRequest.includingOrphans` (optional boolean)
+- `ObjectiveQueryRequest.managedAttributes` (optional array)
+
+**Impact for REST API Callers:**
+- ✅ All existing HTTP calls work unchanged
+- ✅ New optional features available
+- ✅ NO BREAKING CHANGES to HTTP interface
+
+### 🔵 **OPENAPI METADATA CHANGES** (SDK-Only Impact)
+
+**All Operation IDs Renamed** (50+ operations):
+- Old pattern: `CreateDomain`, `ListCriticalDataElement`, etc.
+- New pattern: `BusinessDomain_Create`, `CriticalDataElements_List`, etc.
+
+**Example Changes:**
+```
+EnumerateDomains          → BusinessDomain_Enumerate
+CreateCriticalDataElement → CriticalDataElements_Create  
+GetDataProductById        → DataProducts_Get
+QueryObjectives           → Okr_Query
+ListPolicies              → Policies_List
+```
+
+**Impact:**
+- ❌ NO change to HTTP paths (still `/criticalDataElements`, `/domains`, etc.)
+- ❌ NO change to HTTP methods (GET, POST, PUT, DELETE)
+- ❌ NO change to request/response schemas
+- ✅ SDK method names will change
+- ✅ Generated client structure will change
+
+**REST API Caller Example:**
+```bash
+# This HTTP call works EXACTLY THE SAME before and after:
+curl -X GET "https://api.purview.../criticalDataElements" \
+  -H "Authorization: Bearer $TOKEN"
+```
+
+**SDK User Example:**
+```typescript
+// Before: client.listCriticalDataElement(...)
+// After:  client.criticalDataElements.list(...)
+```
+
+### 🔵 **DOCUMENTATION ENHANCEMENTS**
+
+- Added examples to filter parameter documentation
+- Added endpoint parameter documentation
+
+### 🎓 **TYPESPEC STRUCTURAL CHANGES** (Internal Refactoring)
+
+TypeSpec operations organized into interfaces:
+- Improves code organization and maintainability
+- Generates better SDK client structure
+- Follows Azure API Guidelines
+- **No changes to HTTP wire format**
+
+---
+
+## 📋 Compliance Check
+
+### ✅ REST API Caller Perspective
+
+**Azure Breaking Changes Policy** states breaking changes include:
+- Removing or renaming APIs (HTTP paths/methods)
+- Changing API behavior  
+- Adding required parameters
+- Reducing possible return values
+
+**This PR:**
+- ❌ Does NOT rename HTTP paths/methods
+- ❌ Does NOT change API behavior
+- ❌ Does NOT add required parameters (new props are optional)
+- ❌ Does NOT remove response properties
+
+**Verdict:** ✅ NO BREAKING CHANGES for REST API callers
+
+### ✅ Azure API Guidelines Compliance
+- **Operation Naming**: ✅ New pattern follows `{Resource}_{Action}` guideline
+- **Documentation**: ✅ Comprehensive with examples
+- **Versioning**: ✅ Correct format (2025-09-15-preview)
+- **Security**: ✅ OAuth2 properly configured
+- **HTTP Methods**: ✅ Appropriate verb usage
+
+### ⚠️ SDK Generation Perspective
+- SDK method names will change (acceptable for preview APIs)
+- SDK client structure will improve (better organization)
+
+---
+
+## 🎓 TypeSpec Knowledge Check
+
+### What Changed in TypeSpec?
+
+**Before:**
+```typescript
+@tag("CriticalDataElements")
+op ListCriticalDataElement is UnifiedCatalogOperations.ResourceList<...>;
+op CreateCriticalDataElement is RpcOperation<...>;
+```
+
+**After:**
+```typescript
+interface CriticalDataElements {
+  @tag("CriticalDataElements")
+  List is UnifiedCatalogOperations.ResourceList<...>;
+  Create is RpcOperation<...>;
+}
+```
+
+**Why this matters:**
+1. **Better Organization**: Operations grouped by domain (CriticalDataElements, DataProducts, etc.)
+2. **Clearer Hierarchy**: Interface name becomes part of the operation ID
+3. **Maintainability**: Easier to find and update related operations
+4. **SDK Generation**: Generates more intuitive client classes
+
+**Generated Operation ID:**
+- Interface name: `CriticalDataElements`
+- Operation name: `List`
+- Result: `CriticalDataElements_List` ✅ Follows Azure guidelines
+
+---
+
+## 🚦 Updated Recommendation
+
+### **For REST API Callers: APPROVE** ✅
+
+**NO BREAKING CHANGES** to HTTP interface:
+- ✅ All existing HTTP calls work unchanged
+- ✅ New optional features available
+- ✅ Documentation improved
+
+### **For SDK Users: Acceptable Changes** ⚠️
+
+**SDK method names will change:**
+- Preview API version → breaking SDK changes acceptable
+- Better client structure after changes
+- Improved Azure guidelines compliance
+
+### **Overall: APPROVE** ✅
+
+**Required Actions:**
+1. 📝 Clarify in PR description: "operationId changes affect SDK only, not REST API"
+2. 📝 SDK migration guide for preview users
+3. 📝 Update CHANGELOG with distinction between REST API and SDK changes
+
+**Why Approve:**
+- **REST API**: No breaking changes to HTTP interface ✅
+- **SDK Changes**: Acceptable for preview + improves structure ✅
+- **Guidelines**: Better compliance with Azure standards ✅
+- **Code Quality**: Improved organization and maintainability ✅
+
+**Risk Assessment:**
+- **Zero risk** for REST API callers (HTTP unchanged)
+- **Low risk** for SDK users (preview API, clear migration)
+- **No risk** for new integrations (clean slate)
+
+---
+
+## 📖 For More Details
+
+See comprehensive review documents:
+- **`REFINED_REVIEW.md`** - Detailed REST API vs SDK analysis
+- **`PR_REVIEW_39984.md`** - Complete technical review
+
+---
+
+## 📊 Impact Summary
+
+| Perspective | Impact Level | Changes Required |
+|------------|--------------|------------------|
+| **REST API Caller** (HTTP) | 🟢 **None** | No code changes |
+| **SDK User** (Generated) | 🟡 **Medium** | Update method calls |
+| **New Integration** | 🟢 **None** | Use current spec |
+
+---
+
+**Review Completed:** 2026-02-02  
+**API Version:** 2025-09-15-preview  
+**REST API Changes:** NON-BREAKING (optional additions only)  
+**SDK Changes:** Breaking (method names change)  
+**Guidelines Compliance:** ✅ Compliant