This class inherits from the Node class.
| Property | Description | 
|---|---|
| DTD Name | The name of the Document Type Definition (DTD), which immediately follows the DOCTYPE keyword. Details | 
| Entities NamedNodeMap | A NamedNodeMap that contains the general entities, both external and internal, that the DTD declares. Details | 
| Internal Subset | The internal subset as a string. The property returns an empty string if no internal subset exists. Details | 
| Notations NamedNodeMap | A NamedNodeMap containing the notations that the DTD declares. Details | 
| Public ID | The public identifier of the external subset. Details | 
| System ID | The system identifier of the external subset. Details |