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# SemanticDelta
## Class Definition
```python
class SemanticDelta(created: Tuple[SemanticRef, ...] = (), modified: Tuple[SemanticRef, ...] = (), deleted: Tuple[SemanticRef, ...] = (), metadata: Dict[str, Any] = field(default_factory=dict))
```
*Source: topology.py*
## Import Surface
- top-level: `from simplecadapi import SemanticDelta`
## Description
Semantic entity change set attached to a single recorded operation.