/**
   * Copyright (C) 2016 Michael Kourlas
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  import { IDeclarationOptions, IStringOptions } from "../options";
  import XmlNode from "./XmlNode";
  /**
   * Represents an XML declaration.
   *
   * An XML declaration is structured as follows, where `{version}` is the XML
   * version, `{encoding}` is the encoding of the document, and `{standalone}`
   * is either "yes" or "no", depending on whether the document may contain
   * external markup declarations:
   *
   * ```xml
   * <?xml version="{version}" encoding="{encoding}" standalone="{standalone}"?>
   * ```
   *
   * The `{version}`, `{encoding}`, and `{standalone}` values are properties of
   * this node.
   *
   * XmlDecl nodes cannot have any children.
   */
  export default class XmlDecl extends XmlNode {
      private _encoding?;
      private _standalone?;
      private _version;
      /**
       * Initializes a new instance of the {@link XmlDecl} class.
       *
       * @param options The options associated with the XML declaration.
       */
      constructor(options?: IDeclarationOptions);
      /**
       * Gets the XML encoding to be included in the declaration.
       *
       * @returns The XML encoding to be included in the declaration. This value
       *          may be undefined.
       */
      /**
       * Sets the XML encoding to be included in the declaration.
       *
       * @param encoding The XML encoding to be included in the declaration. This
       *                 value must be a valid encoding. If left undefined, no
       *                 encoding is included.
       */
      encoding: string | undefined;
      /**
       * Gets the XML standalone attribute to be included in the declaration.
       *
       * @returns The XML standalone attribute to be included in the declaration.
       *          This value may be undefined.
       */
      /**
       * Sets the XML standalone attribute to be included in the declaration.
       *
       * @param standalone The XML standalone attribute to be included. This
       *                   value must be "yes" or "no". If left undefined, no
       *                   standalone attribute is included.
       */
      standalone: string | undefined;
      /**
       * Gets the XML version to be included in the declaration.
       *
       * @returns The XML version to tbe included in the declaration.
       */
      /**
       * Sets the XML version to be included in the declaration.
       *
       * @param version The XML version to be included in the declaration. This
       *                value must be a valid XML version number. If left
       *                undefined, the default version is "1.0".
       */
      version: string;
      /**
       * Throws an exception since {@link XmlDecl} nodes cannot have any
       * children.
       *
       * @returns This method does not return.
       */
      children(): XmlNode[];
      /**
       * Throws an exception since {@link XmlDecl} nodes cannot have any
       * children.
       *
       * @param node This parameter is unused.
       * @param index This parameter is unused.
       *
       * @returns This method does not return.
       */
      insertChild(node: XmlNode, index?: number): XmlNode | undefined;
      /**
       * Throws an exception since {@link XmlDecl} nodes cannot have any
       * children.
       *
       * @param node This parameter is unused.
       *
       * @returns This method does not return.
       */
      removeChild(node: XmlNode): boolean;
      /**
       * Throws an exception since {@link XmlDecl} nodes cannot have any
       * children.
       *
       * @param index This parameter is unused.
       *
       * @returns This method does not return.
       */
      removeChildAtIndex(index: number): XmlNode;
      /**
       * Returns an XML string representation of this node.
       *
       * @param options Formatting options for the string representation.
       *
       * @returns An XML string representation of this node.
       */
      toString(options?: IStringOptions): string;
  }