<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def additionalProperties(self):
 """Schema for all additional properties, or False."""

        value = self._schema.get("additionalProperties", {})
        if not isinstance(value, dict) and value is not False:
            raise SchemaError(
                "additionalProperties value {0!r} is neither false nor"
                " an object".format(value))
        return value