Background

Currently, the property observable:IMEI in the observable:MobileDeviceFacet has a max cardinality of 1. This causes issues with devices that contain multiple SIM ports, as each SIM port has its own IMEI.

In a direct and practical example, a commercial forensics tool (appropriately) identified two IMEIs off the sample mobile device and there's not currently a way to represent this without duplicating a observable:MobileDeviceFacet and associating it with the same observable:Device.

Requirements

Requirement 1

Remove the sh:maxCount from the observable:IMEI property of the observable:MobileDeviceFacet.

Risk / Benefit analysis

Benefits

It allows devices that contain multiple SIM cards to be properly represented.

Risks

There are no known risks to existing adopters since it's loosening restrictions.

Competencies demonstrated

Competency 1

Competency Question 1.1

Allow representation of a device with multiple IMEIs.

Result 1.1

{
    "@id": "xxxxxx",
    "@type": "observable:MobileDevice",
    "core:hasFacet" {
        "@id": "xxxxx",
        "@type": "observable:MobileDeviceFacet",
        "observable:storageCapacityInBytes": 12345,
        "observable:IMEI": [
            "12:ab:34:cd:56:ef:78",
            "12:ab:34:cd:56:ef:79"
        ]
    }
}

Solution suggestion

[
    sh:datatype xsd:string ;
    # sh:maxCount "1"^^xsd:integer ; Remove this property
    sh:nodeKind sh:Literal ;
    sh:path observable:IMEI ;
]

Coordination

Tracking in Jira ticket OC-288
[x] Administrative review completed, proposal announced to Ontology Committees (OCs) on 2023-02-07
[x] Requirements to be discussed in OC meeting, 2023-02-23
[x] Requirements Review vote occurred, passing, on 2023-02-23
[x] Requirements development phase completed.
[x] Solution announced to OCs on 2023-03-15
[x] Solutions Approval to be discussed in OC meeting, 2023-03-23
[x] Solutions Approval vote occurred, passing, on 2023-03-23
[x] Solutions development phase completed.
[x] Backwards-compatible implementation merged into develop for the next release
[x] develop state with backwards-compatible implementation merged into develop-2.0.0
[x] Backwards-incompatible implementation merged into develop-2.0.0 (N/A)
[x] Milestone linked
[x] Documentation logged in pending release page

ucoProject / UCO

Unrestrict Cardinality of `observable:IMEI` in `observable:MobileDeviceFacet` #521