Periodic Table Database Schema - v0.6.3
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    DiscoveryGroup: Group<
        {
            country?: Distinct<string | string[]>;
            discoverer?: Distinct<string | string[]>;
            institute?: Distinct<string | string[]>;
            notes?: Distinct<string>;
            references?: RefId[];
            year?: Distinct<number>;
        },
    >

    Historical metadata concerning the first identification of a substance.