import { _XmlWriter } from '../import-export/xml-writer';
import { PdfXmpSchemaType } from '../enumerator';
import { PdfXmpMetadata } from './pdf-xmp-metadata';
/**
 * Represents core XMP metadata properties for a PDF document.
 * ```typescript
 * // Load an existing PDF document
 * let document: PdfDocument = new PdfDocument(data, password);
 * // Access the document properties
 * let documentProperties: PdfDocumentInformation = document.getDocumentInformation(false);
 * // Gets XMP metadata
 * let xmpMetadata: PdfXmpMetadata = documentProperties.xmpMetadata;
 * // Sets creator tool
 * xmp.basicSchema.creatorTool = 'MyApp 1.0';
 * // Save the document
 * document.save('output.pdf');
 * // Destroy the document
 * document.destroy();
 * ```
 */
export declare abstract class PdfXmpSchema {
    /**
     * Parent PdfXmpMetadata reference.
     *
     * @private
     */
    _xmp: PdfXmpMetadata;
    /**
     * Map storing all properties for this schema.
     *
     * @private
     */
    _properties: Map<string, any>;
    /**
     * Custom namespace URI for custom schemas.
     *
     * @private
     */
    _customNamespaceUri?: string;
    /**
     * Namespace prefix for this schema.
     *
     * @private
     */
    _prefix: string;
    /**
     * Schema name identifier.
     *
     * @private
     */
    _name: string;
    /**
     * Initializes a new `PdfXmpSchema` instance.
     *
     * @private
     * @param {PdfXmpMetadata} xmp Optional parent PdfXmpMetadata reference.
     */
    constructor(xmp?: PdfXmpMetadata);
    /**
     * Gets the schema type.
     *
     * @returns {PdfXmpSchemaType} The schema type.
     * ```typescript
     * // Load an existing PDF document
     * let document: PdfDocument = new PdfDocument(data);
     * // Access the document properties
     * let documentProperties: PdfDocumentInformation = document.getDocumentInformation(false);
     * // Gets the dublincore schema from the XMP metadata
     * let basic: PdfBasicSchema = documentProperties.xmpMetadata.basicSchema;
     * // Gets the schema type
     * let schemaType: PdfXmpSchemaType = basic.schemaType;
     * // Save the document
     * document.save('output.pdf');
     * // Destroy the document
     * document.destroy();
     * ```
     */
    abstract readonly schemaType: PdfXmpSchemaType;
    /**
     * Stores a property value in the schema map.
     * Skips null/undefined values. Normalizes Date to ISO 8601 UTC (no ms). Normalizes boolean to "True"/"False".
     *
     * @private
     * @param {string} key The property key.
     * @param {any} value The property value.
     * @returns {void}
     */
    _setProperty(key: string, value: any): void;
    /**
     * Retrieves a property value from the schema map.
     *
     * @private
     * @param {string} key The property key.
     * @returns {any} The stored value, or undefined if not set.
     */
    _getProperty(key: string): any;
    /**
     * Returns the namespace URI for this schema based on its prefix.
     *
     * @private
     * @returns {string} The namespace URI.
     */
    _getNamespaceUri(): string;
    /**
     * Serializes all schema properties to RDF/XML using the provided writer.
     * Iterates sorted property keys; dispatches each to the appropriate value writer.
     *
     * @private
     * @param {_XmlWriter} writer The XML writer to serialize into.
     * @returns {void}
     */
    _writeXml(writer: _XmlWriter): void;
    /**
     * Check the value is the langArray value or not.
     *
     * @private
     * @param {any} value is need to check.
     * @returns {boolean} boolean value of is langArray or not
     */
    private _isLangArray;
    /**
     * Check the value is the thumbnail structure value or not.
     *
     * @private
     * @param {any} value is need to check.
     * @returns {boolean} boolean value of is ThumbnailStruct or not
     */
    private _isThumbnailStruct;
    /**
     * Gets the array type of the value.
     *
     * @private
     * @param {string} key to get the array type.
     * @returns {string} the array type of the element.
     */
    private _getArrayType;
    /**
     * Gets the Namesapce URI for the given prefix.
     *
     * @private
     * @param {string} pfx value to get the namespace URI.
     * @returns {string} the URI value for the given prefix.
     */
    private _getNamespaceUriForPrefix;
}