Google JS library released

As part of Google's effort to better document the open web, they released today some of their Javascript libraries. I browsed a bit through the code, it is well documented and one thing grabbed my attention: the code structure looks similar to dojo, e.g. below a snippet from their DOM lib with ''provide" and "require" statements:

goog.provide('goog.dom');
goog.provide('goog.dom.DomHelper');
goog.provide('goog.dom.NodeType');

goog.require('goog.array');
goog.require('goog.math.Coordinate');
goog.require('goog.math.Size');
goog.require('goog.object');
goog.require('goog.string');
goog.require('goog.userAgent');
...