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tasks/podcast-tui-app/19-import-export.md

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+# 18. Create Sync Data Models (JSON/XML Formats)
+
+meta:
+  id: podcast-tui-app-18
+  feature: podcast-tui-app
+  priority: P1
+  depends_on: [17]
+  tags: [data-models, json, xml, sync, typescript]
+
+objective:
+- Define TypeScript interfaces for JSON sync format
+- Define TypeScript interfaces for XML sync format
+- Ensure compatibility between formats
+- Add validation logic
+
+deliverables:
+- `src/types/sync-json.ts` with JSON sync types
+- `src/types/sync-xml.ts` with XML sync types
+- `src/utils/sync-validation.ts` with validation logic
+- `src/constants/sync-formats.ts` with format definitions
+
+steps:
+- Create `src/types/sync-json.ts`:
+  - `SyncData` interface with all required fields
+  - Include feeds, sources, settings, preferences
+  - Add version field for format compatibility
+  - Add timestamp for last sync
+- Create `src/types/sync-xml.ts`:
+  - `SyncDataXML` interface
+  - XML-compatible type definitions
+  - Root element and child elements
+  - Attributes for metadata
+- Create `src/utils/sync-validation.ts`:
+  - `validateJSONSync(data: unknown): SyncData`
+  - `validateXMLSync(data: unknown): SyncDataXML`
+  - Field validation functions
+  - Type checking
+- Create `src/constants/sync-formats.ts`:
+  - JSON format version
+  - XML format version
+  - Supported versions list
+  - Format extensions
+
+tests:
+- Unit: Test JSON validation with valid/invalid data
+- Unit: Test XML validation with valid/invalid data
+- Integration: Test format compatibility
+
+acceptance_criteria:
+- JSON sync types compile without errors
+- XML sync types compile without errors
+- Validation rejects invalid data
+- Format versions are tracked
+
+validation:
+- Run `bun run build` to verify TypeScript
+- Test validation with sample data
+- Test with invalid data to verify rejection
+
+notes:
+- JSON format: Simple, human-readable
+- XML format: More structured, better for complex data
+- Include all necessary fields for complete sync
+- Add comments explaining each field
+- Ensure backward compatibility