Indicator => Campaign reference appears to be broken

[johnwunder]

In STIX 1.1, the Indicator => Campaign reference mechanism uses an incorrect type and is therefore broken (ish).

<xs:complexType name="RelatedCampaignReferencesType">
    <xs:complexContent>
        <xs:extension base="stixCommon:GenericRelationshipListType">
            <xs:sequence>
                <xs:element name="Related_Campaign" type="stixCommon:CampaignReferenceType" maxOccurs="unbounded">
                    <xs:annotation>
                        <xs:documentation>The Related_Campaign field captures a single relationship to a related campaign.</xs:documentation>
                    </xs:annotation>
                </xs:element>
            </xs:sequence>
        </xs:extension>
    </xs:complexContent>        
</xs:complexType>

That element (Related_Campaign) should point to a relationship type that extends from stixCommon:GenericRelationshipType in order to add Confidence, Relationship, Information_Source, etc. Instead it points directly to a Campaign Reference Type:

<xs:complexType name="CampaignReferenceType">
    <xs:annotation>
        <xs:documentation>Characterizes a reference to a campaign.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
        <xs:element name="Names" type="stixCommon:NamesType" minOccurs="0">
            <xs:annotation>
                <xs:documentation>Specifies one or more campaign names for a cyber threat campaign defined elsewhere.</xs:documentation>
            </xs:annotation>
        </xs:element>
    </xs:sequence>
    <xs:attribute name="idref" type="xs:QName">
        <xs:annotation>
            <xs:documentation>Specifies a globally unique identifier for a cyber threat campaign defined elsewhere.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="timestamp" type="xs:dateTime">
        <xs:annotation>
            <xs:documentation>In conjunction with the idref, this field may be used to reference a specific version of a campaign defined elsewhere.</xs:documentation>
            <xs:documentation>This field must only be used in conjunction with the idref field.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
</xs:complexType>

This means that Indicator => Campaign relationships are unable to express those additional fields (information source, relationship, confidence). The reverse direction is still correct.

In instance content, currently it would look like this:

<Related_Campaign>
    <Names>
        <Name>Campaign Alpha</Name>
    </Names>
</Related_Campaign>

It should look more like this:

<Related_Campaign>
    <Confidence>
        <!-- snip -->
    </Confidence>
    <Campaign>
        <Names>
            <Name>Campaign Alpha</Name>
        </Names>
    </Campaign>
</Related_Campaign>