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diff --git a/src/static/js/AttributePoolFactory.js b/src/static/js/AttributePoolFactory.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.
+ */
+
+exports.createAttributePool = function () {
+  var p = {};
+  p.numToAttrib = {}; // e.g. {0: ['foo','bar']}
+  p.attribToNum = {}; // e.g. {'foo,bar': 0}
+  p.nextNum = 0;
+
+  p.putAttrib = function (attrib, dontAddIfAbsent) {
+    var str = String(attrib);
+    if (str in p.attribToNum) {
+      return p.attribToNum[str];
+    }
+    if (dontAddIfAbsent) {
+      return -1;
+    }
+    var num = p.nextNum++;
+    p.attribToNum[str] = num;
+    p.numToAttrib[num] = [String(attrib[0] || ''), String(attrib[1] || '')];
+    return num;
+  };
+
+  p.getAttrib = function (num) {
+    var pair = p.numToAttrib[num];
+    if (!pair) {
+      return pair;
+    }
+    return [pair[0], pair[1]]; // return a mutable copy
+  };
+
+  p.getAttribKey = function (num) {
+    var pair = p.numToAttrib[num];
+    if (!pair) return '';
+    return pair[0];
+  };
+
+  p.getAttribValue = function (num) {
+    var pair = p.numToAttrib[num];
+    if (!pair) return '';
+    return pair[1];
+  };
+
+  p.eachAttrib = function (func) {
+    for (var n in p.numToAttrib) {
+      var pair = p.numToAttrib[n];
+      func(pair[0], pair[1]);
+    }
+  };
+
+  p.toJsonable = function () {
+    return {
+      numToAttrib: p.numToAttrib,
+      nextNum: p.nextNum
+    };
+  };
+
+  p.fromJsonable = function (obj) {
+    p.numToAttrib = obj.numToAttrib;
+    p.nextNum = obj.nextNum;
+    p.attribToNum = {};
+    for (var n in p.numToAttrib) {
+      p.attribToNum[String(p.numToAttrib[n])] = Number(n);
+    }
+    return p;
+  };
+
+  return p;
+}