selectNodeById(id, options) {

    options = Object.assign({}, options, { outputType: 'hashmap' });
    const result = this.selectNodesByIds([ id ], options);

    return result[id];

  }
Select a single node by id.

@param {Id} id - A node's id
@param {Hashmap} [options]
    Except from the outputType option, all options
    are inherited from {@link Adapter#selectNodesByIds}.
@return {Node|undefined} A node or nothing.