LOX Schema: unclear use of EntityType information

[bergtwvd]

C2SIM Problem Report / Change Request Submitter Name (s): Tom van den Berg Contact email address: Berg, T.W. (Tom) van den tom.vandenberg@tno.nl Submitter Organization(s): TNO Date of Submission: 26 October 2022 Type (Problem Report or Change Request): Problem Report Product: Land Operations Extension Problem/Change Description: The LOX schema allows for multiple APP6, DISentity and NamedEntity values per entity in a LOX XML document.

• The APP6 code on its own is insufficient for SIM initialisation; the SISO entity type value is required.
• To have multiple APP6 codes per entity might be ok (e.g., values for different coding schemes- APP6B, APP6D, ....)
• APP6 coding scheme not specified.
• There can be multiple EntityTypeType values, for instance for a Vehicle element. Unclear how this should be handled by a SIM.
• The mapping with NETN-ORG w.r.t. EntityTypeType is not one-to-one (see https://github.com/AMSP-04/NETN-ORG).

Lastly, the name "DISEntityType" refers to the SISO EntityType enumeration. The name DIS is not correct; SimulationEntityType or just EntityType might be better.

Schema fragment:

    <xs:complexType name="EntityTypeType">
        <xs:annotation>
            <xs:documentation>This is a set of category enumerations, e.g. a DIS type specification, or other set of unique values defining the type of an Entity for representation in simulations and depiction on C2 displays.</xs:documentation>
            <xs:documentation>http://www.sisostds.org/ontologies/C2SIM#EntityType</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element ref="APP6-SIDC"/>
            <xs:element ref="DISEntityType"/>
            <xs:element ref="NamedEntityType"/>
        </xs:choice>
    </xs:complexType>

[clblais]

For discussion with MSG-211 in meetings Oct 11-13: Discussion:

• C2SIM Core ontology declares class Entity with property axiom “hasEntityType min 1 EntityType”
• C2SIM Core ontology declares class EntityType with subclass NamedEntityType with axiom hasEntityTypeString exactly 1 xsd:string
• C2SIM SMX ontology declares two additional subclasses to class EntityType: APP6-SIDC (with axiom hasSIDCString exactly 1 xsd:string (range on data property hasSIDCString is SymbolIDCodeString datatype) and DISEntityType (with axioms for the various parts of the DIS enumeration value)

What is the preferred business rule? For example, permit multiple entries but no more than one of any of the three types (NamedEntityType, APP6-SIDC, DISEntityType*)?

Proposed Resolution: Needs further discussion.

• One option is to redefine the APP6 class to have named subclasses for each APP6 version, each having the correct symbol code string format for that version.
• Should there be agreement in a C2SIM coalition of systems on what single version of each standard (APP6, DIS, and even MIL-STD-2525) is being used for that coalition? (i.e., add this to the list discussed in Issue#49)

There was also a comment that LOX initialization schema element names that have “DIS” in the names should change to a more general name (e.g., change DISEntityType to SISOEntityType)

• Relates to all XML elements (derived from the ontology) with “DIS” in the name (i.e., from properties hasDISCategory, hasDISCountry, etc.)
• A more general name is needed; e.g., change DISEntityType to SISOEntityType Proposed Resolution: In the SMX ontology, rename class DISEntityType to SISOEntityType and change the property names accordingly.

[bruno-g]

Several modifications are done in the ontologies to fulfil the request. Most of the modifications are done in C2SIM.rdf (when not specified below), and some of them in SMX extension (specified below with the smx# prefix):

• class EntityType removed, property hasEntityType removed and replaced by 3 distinct properties: C2SIM#hasSISOEntityType, C2SIM#hasNamedEntityType, smx#hasAPP6CSymbol
• class DISEntityType renamed to SISOEntityType, and moved from SMX to C2SIM
• class NamedEntityType modified with new property restrictions: hasEntityTypeNamespace, hasEntityTypeName
• class smx#APP6-SIDC renamed to smx#APP6CSymbol, and property smx#hasSIDCString renamed to smx#hasAPP6C-SIDC
• class smx#SubjectTypeObservation: property restriction hasEntityType replaced by smx#hasAPP6CSymbol

See commit https://github.com/OpenC2SIM/C2SIMArtifacts/commit/67c675117293b545218f7a7b613b8fc122a31a99 in cwix-2024 branch for the current proposition.