Type of a shader keyword, eg: built-in or user defined.
Additional resources: ShaderKeyword.
| Property | Description | 
|---|---|
| None | No type is assigned. | 
| BuiltinDefault | The keyword is built-in the runtime and it is systematically reserved. | 
| UserDefined | The keyword is defined by the user. | 
| Plugin | The keyword is created by a shader compiler plugin. |