Periodic Table Database Schema - v0.7.1
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    IdentificationCollection: Collection<
        {
            classification?: Group<{ atc?: Distinct<ATCCode>[] }>;
            databases?: Group<
                {
                    chebi?: Distinct<ChEBIID>;
                    chembl?: Distinct<ChEMBLID>;
                    chemspider?: Distinct<ChemSpiderID>;
                    drugbank?: Distinct<DrugBankID>;
                    kegg?: Distinct<KEGGID>;
                    pubchem?: Distinct<PubChemCID>;
                },
            >;
            external?: Group<{ wikidata?: Distinct<WikidataID> }>;
            general?: Group<
                {
                    cas?: Distinct<CASNumber>;
                    ec?: Distinct<ECNumber>;
                    einecs?: Distinct<ECNumber>;
                    elincs?: Distinct<ECNumber>;
                },
            >;
            legacy?: Group<
                {
                    beilstein?: Distinct<BeilsteinNumber>;
                    gmelin?: Distinct<GmelinNumber>;
                    nsc?: Distinct<NSCNumber>;
                },
            >;
            safety?: Group<
                {
                    echa?: Distinct<ECHAInfoCard>;
                    rtecs?: Distinct<RTECSNumber>;
                    unii?: Distinct<UNII>;
                },
            >;
            structure?: Group<{ pdb?: Distinct<PDBID>[] }>;
        },
    >

    Grouping of diverse international identifiers categorized by their scientific or regulatory context.