Inheritance in alloy?

gistfile1.txt

var App = require('application');
exports.definition = {
  config: {
    "adapter": {
      "type": "properties",
      "collection_name": "someChildClass"
    }
  },		
 
  extendModel: function(Model) {
    // IMPORTANT PART
    var Parent = Alloy.createModel('someParentClass', arguments);
    _.extend(Model.prototype, Parent);
    // END
    
    _.extend(Model.prototype, {
      // extended functions go here
    }); // end extend
    return Model;
  },
	
	
  extendCollection: function(Collection) {		
    _.extend(Collection.prototype, {
      // extended functions go here			
    }); // end extend
    
    return Collection;
  }

}