/**
   * Formatting options for the string representation of an {@link XmlNode} and
   * its children. This object is used by the `toString` method of
   * {@link XmlNode}.
   */
  export interface IStringOptions {
      /**
       * Whether double quotes or single quotes should be used in XML attributes.
       * If left undefined, single quotes are used.
       */
      doubleQuotes?: boolean;
      /**
       * The indent string used for pretty-printing. If left undefined, the
       * default indent string is four spaces.
       */
      indent?: string;
      /**
       * The newline string used for pretty-printing. If left undefined, the
       * default newline string is "
  ".
       */
      newline?: string;
      /**
       * Whether pretty-printing is enabled. If left undefined, pretty-printing
       * is enabled.
       */
      pretty?: boolean;
  }
  /**
   * Implementation of the IStringOptions interface used to provide default values
   * to fields.
   *
   * @private
   */
  export declare class StringOptions implements IStringOptions {
      doubleQuotes: boolean;
      indent: string;
      newline: string;
      pretty: boolean;
      constructor(stringOptions?: IStringOptions);
  }
  /**
   * The options associated with the XML declaration. This object is used to
   * create a new {@link XmlDecl} object.
   */
  export interface IDeclarationOptions {
      /**
       * 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;
      /**
       * The XML standalone attribute to be included. This value must be "yes" or
       * "no". If left undefined, no standalone attribute is included.
       */
      standalone?: string;
      /**
       * 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;
  }
  /**
   * Implementation of the IDeclarationOptions interface used to provide default
   * values to fields.
   *
   * @private
   */
  export declare class DeclarationOptions implements IDeclarationOptions {
      encoding?: string;
      standalone?: string;
      version: string;
      constructor(declarationOptions?: IDeclarationOptions);
  }