How to document sub-namespace with JSDoc when using module pattern
/**
 * @namespace The framework's top namespace
 * */
var FX = {
  /**
   * @namespace The core framework functions
   */
  core: {
  }
};

(function( CORE, GLOBAL ) {

    'use strict';

    var _isObject;

    CORE.isObject = _isObject = function( object ) {

        if (null === object || (void 0) === object) {
            return false
        }

        return true;

    };

    return CORE;

})(this.FX.core, this);

/**
 * @memberOf FX.core
 */
CORE.isObject = _isObject = function( object ) {
    // ...
};
// ...