add some more custom config and put every thing in comment in the custom.yaml template
/*
YUI 3.10.3 (build 2fb5187)
Copyright 2013 Yahoo! Inc. All rights reserved.
Licensed under the BSD License.
http://yuilibrary.com/license/
*/
YUI.add("dataschema-base",function(e,t){var n=e.Lang,r={apply:function(e,t){return t},parse:function(t,r){if(r.parser){var i=n.isFunction(r.parser)?r.parser:e.Parsers[r.parser+""];i&&(t=i.call(this,t))}return t}};e.namespace("DataSchema").Base=r,e.namespace("Parsers")},"3.10.3",{requires:["base"]});