The PortObjectType type is intended to characterize networking ports.
The object_reference field specifies a unique ID reference to an Object defined elsewhere. This construct allows for the re-use of the defined Properties of one Object within another, without the need to embed the full Object in the location from which it is being referenced. Thus, this ID reference is intended to resolve to the Properties of the Object that it points to.
The Custom_Properties construct is optional and enables the specification of a set of custom Object Properties that may not be defined in existing Properties schemas.
The required Port_Value field specifies the actual value of the port.
The Layer4_Protocol field specifies the Layer 4 Protocol (OSI Model) associated with the port.