PLM — How to satisfy relationship multiplicities of '1..*' in query results?

For the compositions 'Item_version' and 'Document_version'
we have set xs:nillable='true' to satisfy the multipliciy
constraint '1..*' with nil objects (if required) .

The problem appears in other locations in the informational XML Schema too.
There are many locations in the informational XML Schema with relationships
with the multiplicity '1..*'.
If such a relationship is traversed inside the evaluation of a query in inverse direction
the source objekct of the traversion can be used to satisfy the multiplicity constraint
in the result.
But which objects should be used in other cases to satisfy the multiplicity?

If we have a Work_order_query
and this query selects a Work_order object.
Which activity objects should be added to the result
to satisfy the multiplicity of the Is_controlling association
of the Work_order object:
all, one arbitrary or one nil activity object?

Here is the hopefully complete list of the concerned relationships:
(Referenced_type Referencing_type.Relationship)

Compositions
Translation Translations.Translation
Item_version Item.Item_version
Document_version Document.Document_version
Person_in_organization Person.Person_in_organization

Associations
Accuracy_select Accuracy.Is_defined_for
Activity Work_order.Is_controlling
Approval_element_select Approval.Is_applied_to
Date_and_person_organization Work_request.Notified_person
Date_time_person_organization_element_select
Date_and_person_assignment.Is_applied_to
Date_time_person_organization_element_select
Date_time_assignment.Is_applied_to
Date_time_person_organization_element_select
Person_organization_assignment.Is_applied_to
Document Specific_document_classification.Associated_document
Final_definition_select Final_solution.Final_specification
Item Specific_item_classification.Associated_item
Item_property_select Material.Described_element
Property_value Value_list.Values
Specification Product_specification.Defining_specification
Specification_operand_select Specification_expression.Operand

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