## system_id property


The system identifier of this notation. If the system identifier was not specified, this is null. This may be an absolute URI or not.
### Definition:
```python
@property
def system_id(self):
    ...
@system_id.setter
def system_id(self, value):
    ...
```

### See Also
* module [`aspose.html.dom`](../../)
* class [`Notation`](/html/python-net/aspose.html.dom/notation)