import { BaseValidator } from '../base/base.validator.js';
import { ValidationLevel } from '../../interfaces/common.js';
import type { ValidationResult } from '../../interfaces/common.js';
import { xpath } from '../../plugins.js';
/**
 * Base validator for UBL-based invoice formats
 */
export declare abstract class UBLBaseValidator extends BaseValidator {
    protected doc: Document;
    protected namespaces: Record<string, string>;
    protected select: xpath.XPathSelect;
    constructor(xml: string);
    /**
     * Validates UBL XML against the specified level of validation
     * @param level Validation level
     * @returns Result of validation
     */
    validate(level?: ValidationLevel): ValidationResult;
    /**
     * Validates UBL XML against schema
     * @returns True if schema validation passed
     */
    protected validateSchema(): boolean;
    /**
     * Validates structure of the UBL XML document
     * @returns True if structure validation passed
     */
    protected abstract validateStructure(): boolean;
    /**
     * Gets a text value from an XPath expression
     * @param xpath XPath expression
     * @param context Optional context node
     * @returns Text value or empty string if not found
     */
    protected getText(xpathExpr: string, context?: Node): string;
    /**
     * Gets a number value from an XPath expression
     * @param xpath XPath expression
     * @param context Optional context node
     * @returns Number value or 0 if not found or not a number
     */
    protected getNumber(xpathExpr: string, context?: Node): number;
    /**
     * Checks if a node exists
     * @param xpath XPath expression
     * @param context Optional context node
     * @returns True if node exists
     */
    protected exists(xpathExpr: string, context?: Node): boolean;
}