​8.3​ Optional Features

​8.3.1​ Object-Level Data Markings

A STIX 2.0 Producer or STIX 2.0 Consumer MAY support "Object-Level Data Markings". Software claiming to support "Object-Level Data Markings" MUST follow the normative requirements listed in sections 4.1 and 4.2.

​8.3.2​ Granular Data Markings

A STIX 2.0 Producer or STIX 2.0 Consumer MAY support "Granular Data Markings". Software claiming to support "Granular Data Markings" MUST follow the normative requirements listed in sections 4.1 and 4.3.

​8.3.3​ Custom Properties

A STIX 2.0 Producer or STIX 2.0 Consumer MAY support "Custom Properties". Software claiming to support "Custom Properties" MUST follow the normative requirements listed in section 7.1.

​8.3.4​ Custom Objects

A STIX 2.0 Producer or STIX 2.0 Consumer MAY support "Custom Objects". Software claiming to support "Custom Objects" MUST follow the normative requirements listed in section 7.2.