import { BaseMetadataFieldValidator, DatasetMetadataFieldAndValueInfo } from './BaseMetadataFieldValidator';
export declare class SingleMetadataFieldValidator extends BaseMetadataFieldValidator {
    validate(datasetMetadataFieldAndValueInfo: DatasetMetadataFieldAndValueInfo): void;
    private validateFieldValue;
    private validateControlledVocabularyFieldValue;
    private validateChildMetadataFieldValues;
    /**
     * This method allows setting empty values for conditionally required child fields.
     * A child field is conditionally required if it is required and its parent field is not required.
     * The child field should be required only if any of its sibling fields has a value, otherwise it should be optional.
     */
    private allowEmptyValueForConditionallyRequiredField;
}