import { ExternalDocumentation } from '../../../models/common/ExternalDocumentation';
import { ValidationRuleMetaData } from '../../ValidationRuleMetaData';
import { RequiredPropertyValidationRule } from './RequiredPropertyValidationRule';
/**
 * Constructor.
 * @param {ValidationRuleMetaData} ruleInfo
 * @class
 * @extends RequiredPropertyValidationRule
 * @author eric.wittmann@gmail.com
 */
export declare class OasMissingExternalDocumentationUrlRule extends RequiredPropertyValidationRule {
    constructor(ruleInfo: ValidationRuleMetaData);
    /**
     * @see io.apicurio.datamodels.combined.visitors.CombinedAllNodeVisitor#visitExternalDocumentation(io.apicurio.datamodels.core.models.common.ExternalDocumentation)
     * @param {ExternalDocumentation} node
     */
    visitExternalDocumentation(node: ExternalDocumentation): void;
}