SysProM
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    Variable RELATIONSHIP_ENDPOINT_TYPESConst

    RELATIONSHIP_ENDPOINT_TYPES: Record<
        RelationshipType,
        { from: NodeType[]; to: NodeType[] },
    > = ...

    Defines which node types are valid for the source and target endpoints of each relationship type. Used for semantic validation of graph mutations.

    Note: Permissive by design to allow diverse relationship patterns while catching obvious semantic errors. The model is flexible across abstraction layers.