SysProM
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    Variable ExternalReferenceRoleConst

    ExternalReferenceRole: 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";
    } = externalReferenceRoleDef.schema

    Zod schema for external reference roles (e.g. "input", "output", "evidence").