/**
   * 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 { IStringOptions } from "../options";
  import XmlNode from "./XmlNode";
  /**
   * Represents an XML processing instruction.
   *
   * An XML processing instruction is structured as follows, where `{target}`
   * and `{content}` are the target and content of the processing instruction
   * respectively.
   *
   * ```xml
   * <?{target} {content}?>
   * ```
   *
   * The `{target}` and `{content}` values are properties of this node.
   *
   * XmlProcInst nodes cannot have any children.
   */
  export default class XmlProcInst extends XmlNode {
      private _target;
      private _content?;
      /**
       * Initializes a new instance of the {@link XmlProcInst} class.
       *
       * @param target The target of the processing instruction.
       * @param content The data of the processing instruction, or undefined if
       *                there is no target.
       */
      constructor(target: string, content?: string);
      /**
       * Gets the target of the processing instruction.
       *
       * @returns The target of the processing instruction.
       */
      /**
       * Sets the target of the processing instruction.
       *
       * @param target The target of the processing instruction.
       */
      target: string;
      /**
       * Gets the data of the processing instruction.
       *
       * @returns The data of the processing instruction. This value may be
       *          undefined.
       */
      /**
       * Sets the data of the processing instruction.
       *
       * @param content The data of the processing instruction. This value may be
       *                undefined.
       */
      content: string | undefined;
      /**
       * Throws an exception since {@link XmlProcInst} nodes cannot have any
       * children.
       *
       * @returns This method does not return.
       */
      children(): XmlNode[];
      /**
       * Throws an exception since {@link XmlProcInst} 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 XmlProcInst} 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 XmlProcInst} 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 {string} An XML string representation of this node.
       */
      toString(options?: IStringOptions): string;
  }