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diff --git a/src/static/js/AttributePool.js b/src/static/js/AttributePool.js
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+/**
+ * This code represents the Attribute Pool Object of the original Etherpad.
+ * 90% of the code is still like in the original Etherpad
+ * Look at https://github.com/ether/pad/blob/master/infrastructure/ace/www/easysync2.js
+ * You can find a explanation what a attribute pool is here:
+ * https://github.com/Pita/etherpad-lite/blob/master/doc/easysync/easysync-notes.txt
+ */
+
+/*
+ * Copyright 2009 Google Inc., 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
+ *
+ * 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.
+ */
+
+/*
+  An AttributePool maintains a mapping from [key,value] Pairs called
+  Attributes to Numbers (unsigened integers) and vice versa. These numbers are
+  used to reference Attributes in Changesets.
+*/
+
+var AttributePool = function () {
+  this.numToAttrib = {}; // e.g. {0: ['foo','bar']}
+  this.attribToNum = {}; // e.g. {'foo,bar': 0}
+  this.nextNum = 0;
+};
+
+AttributePool.prototype.putAttrib = function (attrib, dontAddIfAbsent) {
+  var str = String(attrib);
+  if (str in this.attribToNum) {
+    return this.attribToNum[str];
+  }
+  if (dontAddIfAbsent) {
+    return -1;
+  }
+  var num = this.nextNum++;
+  this.attribToNum[str] = num;
+  this.numToAttrib[num] = [String(attrib[0] || ''), String(attrib[1] || '')];
+  return num;
+};
+
+AttributePool.prototype.getAttrib = function (num) {
+  var pair = this.numToAttrib[num];
+  if (!pair) {
+    return pair;
+  }
+  return [pair[0], pair[1]]; // return a mutable copy
+};
+
+AttributePool.prototype.getAttribKey = function (num) {
+  var pair = this.numToAttrib[num];
+  if (!pair) return '';
+  return pair[0];
+};
+
+AttributePool.prototype.getAttribValue = function (num) {
+  var pair = this.numToAttrib[num];
+  if (!pair) return '';
+  return pair[1];
+};
+
+AttributePool.prototype.eachAttrib = function (func) {
+  for (var n in this.numToAttrib) {
+    var pair = this.numToAttrib[n];
+    func(pair[0], pair[1]);
+  }
+};
+
+AttributePool.prototype.toJsonable = function () {
+  return {
+    numToAttrib: this.numToAttrib,
+    nextNum: this.nextNum
+  };
+};
+
+AttributePool.prototype.fromJsonable = function (obj) {
+  this.numToAttrib = obj.numToAttrib;
+  this.nextNum = obj.nextNum;
+  this.attribToNum = {};
+  for (var n in this.numToAttrib) {
+    this.attribToNum[String(this.numToAttrib[n])] = Number(n);
+  }
+  return this;
+};
+  
+
+module.exports = AttributePool;
+\ No newline at end of file