SysProM
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    Variable ExternalReferenceConst

    ExternalReference: ZodObject<
        {
            description: ZodOptional<
                ZodUnion<readonly [ZodString, ZodArray<ZodString>]> & {
                    is(value: unknown): value is string | string[];
                },
            >;
            identifier: ZodString;
            internalised: ZodOptional<
                ZodUnion<readonly [ZodString, ZodArray<ZodString>]> & {
                    is(value: unknown): value is string | string[];
                },
            >;
            node_id: ZodOptional<ZodString>;
            role: ZodEnum<
                {
                    context: "context";
                    evidence: "evidence";
                    input: "input";
                    output: "output";
                    prior_art: "prior_art";
                    source: "source";
                    standard: "standard";
                },
            > & {
                is(
                    value: unknown,
                ): value is
                    | "output"
                    | "input"
                    | "context"
                    | "evidence"
                    | "source"
                    | "standard"
                    | "prior_art";
            };
        },
        $strip,
    > & {
        is(
            value: unknown,
        ): value is {
            description?: string | string[];
            identifier: string;
            internalised?: string | string[];
            node_id?: string;
            role:
                | "output"
                | "input"
                | "context"
                | "evidence"
                | "source"
                | "standard"
                | "prior_art";
        };
    } = ...

    Zod schema for an external reference — a link to a resource outside the SysProM graph.