def test_add_stix_package(self):
        from stix.core import STIXPackage

        l = RelatedPackageRefs()
        l.append(STIXPackage())

        self.assertEqual(1, len(l))

    def from_obj(cls, obj, return_obj=None):
        if not obj:
            return None
        if not return_obj:
            return_obj = cls()

        return_obj.id_ = obj.get_id()
        return_obj.idref = obj.get_idref()
        return_obj.timestamp = obj.get_timestamp() # not yet implemented

        if isinstance(obj, cls._binding_class): # TTPType properties
            return_obj.version = obj.get_version() or cls._version
            return_obj.title = obj.get_Title()
            return_obj.description = StructuredText.from_obj(obj.get_Description())
            return_obj.short_description = StructuredText.from_obj(obj.get_Short_Description())
            return_obj.information_source = InformationSource.from_obj(obj.get_Information_Source())
            return_obj.handling = Marking.from_obj(obj.get_Handling())
            return_obj.potential_coas = PotentialCOAs.from_obj(obj.get_Potential_COAs())
            return_obj.related_exploit_targets = RelatedExploitTargets.from_obj(obj.get_Related_Exploit_Targets())
            return_obj.vulnerabilities = [Vulnerability.from_obj(x) for x in obj.get_Vulnerability()]
            return_obj.weakness = [Weakness.from_obj(x) for x in obj.get_Weakness()]
            return_obj.configuration = [Configuration.from_obj(x) for x in obj.get_Configuration()]
            return_obj.related_packages = RelatedPackageRefs.from_obj(obj.get_Related_Packages())

        return return_obj

    def from_obj(cls, obj, return_obj=None):
        if not obj:
            return None
        if not return_obj:
            return_obj = cls()

        return_obj.id_ = obj.id
        return_obj.idref = obj.idref
        return_obj.timestamp = obj.timestamp # not yet implemented

        if isinstance(obj, cls._binding_class): # TTPType properties
            return_obj.version = obj.version
            return_obj.title = obj.Title
            return_obj.description = StructuredText.from_obj(obj.Description)
            return_obj.short_description = StructuredText.from_obj(obj.Short_Description)
            return_obj.information_source = InformationSource.from_obj(obj.Information_Source)
            return_obj.handling = Marking.from_obj(obj.Handling)
            return_obj.potential_coas = PotentialCOAs.from_obj(obj.Potential_COAs)
            return_obj.related_exploit_targets = RelatedExploitTargets.from_obj(obj.Related_Exploit_Targets)
            return_obj.vulnerabilities = [Vulnerability.from_obj(x) for x in obj.Vulnerability]
            return_obj.weaknesses = [Weakness.from_obj(x) for x in obj.Weakness]
            return_obj.configuration = [Configuration.from_obj(x) for x in obj.Configuration]
            return_obj.related_packages = RelatedPackageRefs.from_obj(obj.Related_Packages)

        return return_obj

    def from_dict(cls, dict_repr, return_obj=None):
        if not dict_repr:
            return None

        if not return_obj:
            return_obj = cls()

        super(ThreatActor, cls).from_dict(dict_repr, return_obj=return_obj)

        get = dict_repr.get
        return_obj.identity = Identity.from_dict(get('identity'))
        return_obj.types = _Types.from_dict(get('types'))
        return_obj.motivations = _Motivations.from_dict(get('motivations'))
        return_obj.sophistications = _Sophistications.from_dict(get('sophistications'))
        return_obj.intended_effects = _IntendedEffects.from_dict(get('intended_effects'))
        return_obj.planning_and_operational_supports = \
            _PlanningAndOperationalSupports.from_dict(get('planning_and_operational_supports'))
        return_obj.observed_ttps = ObservedTTPs.from_dict(get('observed_ttps'))
        return_obj.associated_campaigns = AssociatedCampaigns.from_dict(get('associated_campaigns'))
        return_obj.associated_actors = AssociatedActors.from_dict(get('associated_actors'))
        return_obj.handling = Marking.from_dict(get('handling'))
        return_obj.confidence = Confidence.from_dict(get('confidence'))
        return_obj.related_packages = RelatedPackageRefs.from_dict(get('related_packages'))

        return return_obj

    def from_dict(cls, dict_repr, return_obj=None):
        if not dict_repr:
            return None

        if not return_obj:
            return_obj = cls()

        return_obj.id_ = dict_repr.get('id')
        return_obj.idref = dict_repr.get('idref')
        return_obj.timestamp = dict_repr.get('timestamp')
        return_obj.version = dict_repr.get('version')
        return_obj.title = dict_repr.get('title')
        return_obj.description = StructuredText.from_dict(dict_repr.get('description'))
        return_obj.short_description = StructuredText.from_dict(dict_repr.get('short_description'))
        return_obj.identity = Identity.from_dict(dict_repr.get('identity'))
        return_obj.types = [Statement.from_dict(x) for x in dict_repr.get('types', [])]
        return_obj.motivations = [Statement.from_dict(x) for x in dict_repr.get('motivations', [])]
        return_obj.sophistications = [Statement.from_dict(x) for x in dict_repr.get('sophistications', [])]
        return_obj.intended_effects = [Statement.from_dict(x) for x in dict_repr.get('intended_effects', [])]
        return_obj.planning_and_operational_supports = [Statement.from_dict(x)
                for x in dict_repr.get('planning_and_operational_supports', [])]
        return_obj.observed_ttps = ObservedTTPs.from_dict(dict_repr.get('observed_ttps'))
        return_obj.associated_campaigns = AssociatedCampaigns.from_dict(dict_repr.get('associated_campaigns'))
        return_obj.associated_actors = AssociatedActors.from_dict(dict_repr.get('associated_actors'))
        return_obj.handling = Marking.from_dict(dict_repr.get('handling'))
        return_obj.confidence = Confidence.from_dict(dict_repr.get('confidence'))
        return_obj.information_source = InformationSource.from_dict(dict_repr.get('information_source'))
        return_obj.related_packages = RelatedPackageRefs.from_dict(dict_repr.get('related_packages'))

        return return_obj

    def from_dict(cls, dict_repr, return_obj=None):
        if not dict_repr:
            return None
        if not return_obj:
            return_obj = cls()

        return_obj.id_ = dict_repr.get('id')
        return_obj.idref = dict_repr.get('idref')
        return_obj.timestamp = dict_repr.get('timestamp')
        return_obj.version = dict_repr.get('version')
        return_obj.title = dict_repr.get('title')
        return_obj.stage = VocabString.from_dict(dict_repr.get('stage'))
        return_obj.type_ = VocabString.from_dict(dict_repr.get('type'))
        return_obj.description = StructuredText.from_dict(dict_repr.get('description'))
        return_obj.short_description = StructuredText.from_dict(dict_repr.get('short_description'))
        return_obj.objective = Objective.from_dict(dict_repr.get('objective'))
        return_obj.parameter_observables = \
                Observables.from_dict(dict_repr.get('parameter_observables'))
        return_obj.impact = Statement.from_dict(dict_repr.get('impact'))
        return_obj.cost = Statement.from_dict(dict_repr.get('cost'))
        return_obj.efficacy = Statement.from_dict(dict_repr.get('efficacy'))
        return_obj.information_source = InformationSource.from_dict(dict_repr.get('information_source'))
        return_obj.handling = Marking.from_dict(dict_repr.get('handling'))
        return_obj.related_coas = \
                RelatedCOAs.from_dict(dict_repr.get('related_coas'))
        return_obj.related_packages = \
                RelatedPackageRefs.from_dict(dict_repr.get('related_packages'))

        return return_obj

    def from_dict(cls, dict_repr, return_obj=None):
        if not dict_repr:
            return None

        if not return_obj:
            return_obj = cls()

        super(Incident, cls).from_dict(dict_repr, return_obj=return_obj)

        get = dict_repr.get
        return_obj.time = Time.from_dict(get('time'))
        return_obj.victims = _Victims.from_dict(get('victims'))
        return_obj.categories = IncidentCategories.from_dict(get('categories'))
        return_obj.attributed_threat_actors = AttributedThreatActors.from_dict(get('attributed_threat_actors'))
        return_obj.related_indicators = RelatedIndicators.from_dict(get('related_indicators'))
        return_obj.related_observables = RelatedObservables.from_dict(get('related_observables'))
        return_obj.related_incidents = RelatedIncidents.from_dict(get('related_incidents'))
        return_obj.intended_effects = _IntendedEffects.from_list(get('intended_effects'))
        return_obj.leveraged_ttps = LeveragedTTPs.from_dict(get('leveraged_ttps'))
        return_obj.affected_assets = AffectedAssets.from_dict(get('affected_assets'))
        return_obj.discovery_methods = DiscoveryMethods.from_dict(get('discovery_methods'))
        return_obj.reporter = InformationSource.from_dict(get('reporter'))
        return_obj.responders = _InformationSources.from_dict(get('responders'))
        return_obj.coordinators = _InformationSources.from_dict(get('coordinators'))
        return_obj.external_ids = _ExternalIDs.from_dict(get('external_ids'))
        return_obj.impact_assessment = ImpactAssessment.from_dict(get('impact_assessment'))
        return_obj.security_compromise = VocabString.from_dict(get('security_compromise'))
        return_obj.confidence = Confidence.from_dict(get('confidence'))
        return_obj.coa_taken = _COAsTaken.from_dict(get('coa_taken'))
        return_obj.coa_requested = _COAsRequested.from_dict(get('coa_requested'))
        return_obj.status = VocabString.from_dict(get('status'))
        return_obj.history = History.from_dict(get('history'))
        return_obj.related_packages = RelatedPackageRefs.from_dict(get('related_packages'))

        return return_obj

    def __init__(self, id_=None, idref=None, timestamp=None, title=None, description=None, short_description=None):
        self.id_ = id_ or stix.utils.create_id("threatactor")
        self.idref = idref
        self.version = None
        self.title = title
        self.description = description
        self.short_description = short_description
        self.identity = None
        self.types = None
        self.motivations = None
        self.sophistications = None
        self.intended_effects = None
        self.planning_and_operational_supports = None
        self.handling = None
        self.confidence = None
        self.information_source = None
        self.observed_ttps = ObservedTTPs()
        self.associated_campaigns = AssociatedCampaigns()
        self.associated_actors = AssociatedActors()
        self.related_packages = RelatedPackageRefs()

        if timestamp:
            self.timestamp = timestamp
        else:
            self.timestamp = datetime.now(tzutc()) if not idref else None

    def __init__(self, id_=None, idref=None, timestamp=None, title=None, description=None, short_description=None):
        super(Incident, self).__init__(
            id_=id_,
            idref=idref,
            timestamp=timestamp,
            title=title,
            description=description,
            short_description=short_description
        )

        self.status = None
        self.time = None
        self.victims = None
        self.attributed_threat_actors = AttributedThreatActors()
        self.related_indicators = RelatedIndicators()
        self.related_observables = RelatedObservables()
        self.related_incidents = RelatedIncidents()
        self.related_packages = RelatedPackageRefs()
        self.affected_assets = None
        self.categories = None
        self.intended_effects = None
        self.leveraged_ttps = LeveragedTTPs()
        self.discovery_methods = None
        self.reporter = None
        self.responders = None
        self.coordinators = None
        self.external_ids = None
        self.impact_assessment = None
        self.security_compromise = None
        self.confidence = None
        self.coa_taken = None
        self.coa_requested = None
        self.history = History()

    def from_obj(cls, obj, return_obj=None):
        if not obj:
            return None

        if not return_obj:
            return_obj = cls()

        super(Incident, cls).from_obj(obj, return_obj=return_obj)

        if isinstance(obj, cls._binding_class):
            return_obj.time = Time.from_obj(obj.Time)
            return_obj.victims = _Victims.from_obj(obj.Victim)
            return_obj.categories = IncidentCategories.from_obj(obj.Categories)
            return_obj.intended_effects = _IntendedEffects.from_obj(obj.Intended_Effect)
            return_obj.affected_assets = AffectedAssets.from_obj(obj.Affected_Assets)
            return_obj.discovery_methods = DiscoveryMethods.from_obj(obj.Discovery_Method)
            return_obj.coa_taken = _COAsTaken.from_obj(obj.COA_Taken)
            return_obj.coa_requested = _COAsRequested.from_obj(obj.COA_Requested)
            return_obj.confidence = Confidence.from_obj(obj.Confidence)
            return_obj.attributed_threat_actors = AttributedThreatActors.from_obj(obj.Attributed_Threat_Actors)
            return_obj.related_indicators = RelatedIndicators.from_obj(obj.Related_Indicators)
            return_obj.related_observables = RelatedObservables.from_obj(obj.Related_Observables)
            return_obj.leveraged_ttps = LeveragedTTPs.from_obj(obj.Leveraged_TTPs)
            return_obj.related_incidents = RelatedIncidents.from_obj(obj.Related_Incidents)
            return_obj.status = VocabString.from_obj(obj.Status)
            return_obj.history = History.from_obj(obj.History)
            return_obj.responders = _InformationSources.from_obj(obj.Responder)
            return_obj.coordinators = _InformationSources.from_obj(obj.Coordinator)
            return_obj.external_ids = _ExternalIDs.from_obj(obj.External_ID)
            return_obj.reporter = InformationSource.from_obj(obj.Reporter)
            return_obj.impact_assessment = ImpactAssessment.from_obj(obj.Impact_Assessment)
            return_obj.security_compromise = VocabString.from_obj(obj.Security_Compromise)
            return_obj.related_packages = RelatedPackageRefs.from_obj(obj.Related_Packages)

        return return_obj

    def __init__(self, id_=None, idref=None, timestamp=None, title=None, description=None, short_description=None):
        self.id_ = id_ or stix.utils.create_id("Campaign")
        self.idref = idref
        self.version = None # self._version
        self.title = title
        self.description = description
        self.short_description = short_description
        self.names = None
        self.intended_effects = None
        self.status = None
        self.related_ttps = RelatedTTPs()
        self.related_incidents = RelatedIncidents()
        self.related_indicators = RelatedIndicators()
        self.attribution = AttributionList()
        self.associated_campaigns = AssociatedCampaigns()
        self.confidence = None
        self.activity = []
        self.information_source = None
        self.handling = None
        self.related_packages = RelatedPackageRefs()

        if timestamp:
            self.timestamp = timestamp
        else:
            self.timestamp = datetime.now(tzutc()) if not idref else None

    def from_dict(cls, dict_repr, return_obj=None):
        if not dict_repr:
            return None
        if not return_obj:
            return_obj = cls()

        super(Indicator, cls).from_dict(dict_repr, return_obj=return_obj)

        get = dict_repr.get
        return_obj.negate    = get('negate')
        return_obj.alternative_id = get('alternative_id')
        return_obj.indicated_ttps = _IndicatedTTPs.from_dict(get('indicated_ttps'))
        return_obj.test_mechanisms = TestMechanisms.from_list(get('test_mechanisms'))
        return_obj.suggested_coas = SuggestedCOAs.from_dict(get('suggested_coas'))
        return_obj.sightings = Sightings.from_dict(get('sightings'))
        return_obj.composite_indicator_expression = CompositeIndicatorExpression.from_dict(get('composite_indicator_expression'))
        return_obj.kill_chain_phases = KillChainPhasesReference.from_dict(get('kill_chain_phases'))
        return_obj.related_indicators = RelatedIndicators.from_dict(get('related_indicators'))
        return_obj.likely_impact = Statement.from_dict(get('likely_impact'))
        return_obj.indicator_types = IndicatorTypes.from_list(get('indicator_types'))
        return_obj.confidence = Confidence.from_dict(get('confidence'))
        return_obj.valid_time_positions = _ValidTimePositions.from_dict(get('valid_time_positions'))
        return_obj.observable = Observable.from_dict(get('observable'))
        return_obj.producer = InformationSource.from_dict(get('producer'))
        return_obj.related_campaigns = RelatedCampaignRefs.from_dict(get('related_campaigns'))
        return_obj.related_packages = RelatedPackageRefs.from_dict(get('related_packages'))

        return return_obj

    def from_obj(cls, obj, return_obj=None):        
        if not obj:
            return None
        if not return_obj:
            return_obj = cls()

        super(Indicator, cls).from_obj(obj, return_obj=return_obj)

        if isinstance(obj, cls._binding_class):
            return_obj.negate = obj.negate
            return_obj.producer = InformationSource.from_obj(obj.Producer)
            return_obj.confidence = Confidence.from_obj(obj.Confidence)
            return_obj.sightings = Sightings.from_obj(obj.Sightings)
            return_obj.composite_indicator_expression = CompositeIndicatorExpression.from_obj(obj.Composite_Indicator_Expression)
            return_obj.kill_chain_phases = KillChainPhasesReference.from_obj(obj.Kill_Chain_Phases)
            return_obj.related_indicators = RelatedIndicators.from_obj(obj.Related_Indicators)
            return_obj.likely_impact = Statement.from_obj(obj.Likely_Impact)
            return_obj.indicator_types = IndicatorTypes.from_obj(obj.Type)
            return_obj.test_mechanisms = TestMechanisms.from_obj(obj.Test_Mechanisms)
            return_obj.suggested_coas = SuggestedCOAs.from_obj(obj.Suggested_COAs)
            return_obj.alternative_id = obj.Alternative_ID
            return_obj.indicated_ttps = _IndicatedTTPs.from_obj(obj.Indicated_TTP)
            return_obj.valid_time_positions = _ValidTimePositions.from_obj(obj.Valid_Time_Position)
            return_obj.observable = Observable.from_obj(obj.Observable)
            return_obj.related_campaigns = RelatedCampaignRefs.from_obj(obj.Related_Campaigns)
            return_obj.related_packages = RelatedPackageRefs.from_obj(obj.Related_Packages)
            
        return return_obj

    def from_obj(cls, obj, return_obj=None):
        if not obj:
            return None
        if not return_obj:
            return_obj = cls()

        return_obj.id_ = obj.get_id()
        return_obj.idref = obj.get_idref()
        return_obj.timestamp = obj.get_timestamp()
        if isinstance(obj, cls._binding_class): # ThreatActorType properties
            return_obj.version = obj.get_version() if obj.get_version() else cls._version
            return_obj.title = obj.get_Title()
            return_obj.description = StructuredText.from_obj(obj.get_Description())
            return_obj.short_description = StructuredText.from_obj(obj.get_Short_Description())
            return_obj.identity = Identity.from_obj(obj.get_Identity())
            return_obj.types = [Statement.from_obj(x) for x in obj.get_Type()]
            return_obj.motivations = [Statement.from_obj(x) for x in obj.get_Motivation()]
            return_obj.sophistications = [Statement.from_obj(x) for x in obj.get_Sophistication()]
            return_obj.intended_effects = [Statement.from_obj(x) for x in obj.get_Intended_Effect()]
            return_obj.planning_and_operational_supports = [Statement.from_obj(x) for x in obj.get_Planning_And_Operational_Support()]
            return_obj.observed_ttps = ObservedTTPs.from_obj(obj.get_Observed_TTPs())
            return_obj.associated_campaigns = AssociatedCampaigns.from_obj(obj.get_Associated_Campaigns())
            return_obj.associated_actors = AssociatedActors.from_obj(obj.get_Associated_Actors())
            return_obj.handling = Marking.from_obj(obj.get_Handling())
            return_obj.confidence = Confidence.from_obj(obj.get_Confidence())
            return_obj.information_source = InformationSource.from_obj(obj.get_Information_Source())
            return_obj.related_packages = RelatedPackageRefs.from_obj(obj.get_Related_Packages())

        return return_obj

    def from_obj(cls, obj, return_obj=None):
        if not obj:
            return None
        if not return_obj:
            return_obj = cls()

        return_obj.id_ = obj.id
        return_obj.idref = obj.idref
        return_obj.timestamp = obj.timestamp

        if isinstance(obj, cls._binding_class): # CourseOfActionType properties
            return_obj.version = obj.version
            return_obj.title = obj.Title
            return_obj.stage = VocabString.from_obj(obj.Stage)
            return_obj.type_ = VocabString.from_obj(obj.Type)
            return_obj.description = StructuredText.from_obj(obj.Description)
            return_obj.short_description = StructuredText.from_obj(obj.Short_Description)
            return_obj.objective = Objective.from_obj(obj.Objective)
            return_obj.parameter_observables = \
                    Observables.from_obj(obj.Parameter_Observables)
            return_obj.impact = Statement.from_obj(obj.Impact)
            return_obj.cost = Statement.from_obj(obj.Cost)
            return_obj.efficacy = Statement.from_obj(obj.Efficacy)
            return_obj.information_source = InformationSource.from_obj(obj.Information_Source)
            return_obj.handling = Marking.from_obj(obj.Handling)
            return_obj.related_coas = \
                    RelatedCOAs.from_obj(obj.Related_COAs)
            return_obj.related_packages = \
                    RelatedPackageRefs.from_obj(obj.Related_Packages)

        return return_obj

    def from_dict(cls, dict_repr, return_obj=None):
        if not dict_repr:
            return None

        if not return_obj:
            return_obj = cls()

        super(Campaign, cls).from_dict(dict_repr, return_obj=return_obj)

        get = dict_repr.get  # PEP 8 line lengths
        return_obj.names = Names.from_dict(get('names'))
        return_obj.intended_effects = \
            _IntendedEffects.from_dict(get('intended_effects'))
        return_obj.status = VocabString.from_dict(get('status'))
        return_obj.related_ttps = \
            RelatedTTPs.from_dict(get('related_ttps'))
        return_obj.related_incidents = \
            RelatedIncidents.from_dict(get('related_incidents'))
        return_obj.related_indicators = \
            RelatedIndicators.from_dict(get('related_indicators'))
        return_obj.attribution = _AttributionList.from_list(get('attribution'))
        return_obj.associated_campaigns = \
            AssociatedCampaigns.from_dict(get('associated_campaigns'))
        return_obj.confidence = \
            Confidence.from_dict(get('confidence'))
        return_obj.activity = _Activities.from_dict(get('activity'))
        return_obj.related_packages = \
            RelatedPackageRefs.from_dict(get('related_packages'))

        return return_obj

    def from_obj(cls, obj, return_obj=None):
        if not obj:
            return None
        if not return_obj:
            return_obj = cls()

        return_obj.id_ = obj.get_id()
        return_obj.idref = obj.get_idref()
        return_obj.timestamp = obj.get_timestamp()

        if isinstance(obj, cls._binding_class): # CourseOfActionType properties
            return_obj.version = obj.get_version() or cls._version
            return_obj.title = obj.get_Title()
            return_obj.stage = VocabString.from_obj(obj.get_Stage())
            return_obj.type_ = VocabString.from_obj(obj.get_Type())
            return_obj.description = StructuredText.from_obj(obj.get_Description())
            return_obj.short_description = StructuredText.from_obj(obj.get_Short_Description())
            return_obj.objective = Objective.from_obj(obj.get_Objective())
            return_obj.parameter_observables = \
                    Observables.from_obj(obj.get_Parameter_Observables())
            return_obj.impact = Statement.from_obj(obj.get_Impact())
            return_obj.cost = Statement.from_obj(obj.get_Cost())
            return_obj.efficacy = Statement.from_obj(obj.get_Efficacy())
            return_obj.information_source = InformationSource.from_obj(obj.get_Information_Source())
            return_obj.handling = Marking.from_obj(obj.get_Handling())
            return_obj.related_coas = \
                    RelatedCOAs.from_obj(obj.get_Related_COAs())
            return_obj.related_packages = \
                    RelatedPackageRefs.from_obj(obj.get_Related_Packages())

        return return_obj

    def from_obj(cls, obj, return_obj=None):
        if not obj:
            return None

        if not return_obj:
            return_obj = cls()

        super(Campaign, cls).from_obj(obj, return_obj=return_obj)

        if isinstance(obj, cls._binding_class):
            return_obj.names = Names.from_obj(obj.Names)
            return_obj.intended_effects = \
                _IntendedEffects.from_obj(obj.Intended_Effect)
            return_obj.status = VocabString.from_obj(obj.Status)
            return_obj.related_ttps = RelatedTTPs.from_obj(obj.Related_TTPs)
            return_obj.related_incidents = \
                RelatedIncidents.from_obj(obj.Related_Incidents)
            return_obj.related_indicators = \
                RelatedIndicators.from_obj(obj.Related_Indicators)
            return_obj.attribution = _AttributionList.from_obj(obj.Attribution)
            return_obj.associated_campaigns = \
                AssociatedCampaigns.from_obj(obj.Associated_Campaigns)
            return_obj.confidence = Confidence.from_obj(obj.Confidence)
            return_obj.activity = _Activities.from_obj(obj.Activity)
            return_obj.related_packages = \
                RelatedPackageRefs.from_obj(obj.Related_Packages)

        return return_obj

    def __init__(self, id_=None, idref=None, timestamp=None, title=None,
                 description=None, short_description=None):

        super(Indicator, self).__init__(
            id_=id_,
            idref=idref,
            timestamp=timestamp,
            title=title,
            description=description,
            short_description=short_description
        )

        self.producer = None
        self.observables = None
        self.indicator_types = IndicatorTypes()
        self.confidence = None
        self.indicated_ttps = _IndicatedTTPs()
        self.test_mechanisms = TestMechanisms()
        self.alternative_id = None
        self.suggested_coas = SuggestedCOAs()
        self.sightings = Sightings()
        self.composite_indicator_expression = None
        self.kill_chain_phases = KillChainPhasesReference()
        self.valid_time_positions = _ValidTimePositions()
        self.related_indicators = None
        self.related_campaigns = RelatedCampaignRefs()
        self.observable_composition_operator = "OR"
        self.likely_impact = None
        self.negate = None
        self.related_packages = RelatedPackageRefs()

 def __init__(self, id_=None, idref=None, timestamp=None, title=None, description=None, short_description=None):
     self.id_ = id_ or stix.utils.create_id("et")
     self.idref = idref
     self.timestamp = timestamp or datetime.now()
     self.version = self._version
     self.title = title
     self.description = description
     self.short_description = short_description
     self.information_source = None
     self.handling = None
     self.potential_coas = PotentialCOAs()
     self.related_exploit_targets = RelatedExploitTargets()
     self.vulnerabilities = None
     self.weakness = None
     self.configuration = None
     self.related_packages = RelatedPackageRefs()