lib/Document.js
function MultiId(node) {
  this.nodes = Object.create(null);
  this.nodes[node._nid] = node;
  this.length = 1;
  this.firstNode = undefined;
}
function MultiId(node) {
  this.nodes = Object.create(null);
  this.nodes[node._nid] = node;
  this.length = 1;
  this.firstNode = undefined;
}
function MultiId ( node ) { this . nodes = Object . create ( null ) ; this . nodes [ node . _nid ] = node ; this . length = 1 ; this . firstNode = undefined ; }
A class for storing multiple nodes with the same ID
A class for storing multiple nodes with the same ID